my truck started having an idle surge problem recently right after i installed stacks? i thought it was because i had to put an old pmd in but i have since changed it and same thing... when ever it is cold it surges; chug...chug...chug but when it warms up i cannot get it to do it unless i hook up my gmtdscantech and try to raise the idle to 1500 through the program if i raise it with the pedal its fine... today i tried, topping off engine oil, changing fuel filters,using jumper cables to check for ground problems, and lastly tightening all fuel connections but couldnt tell the difference it was already warm and running fine buy then... when i hook up my scantech it says the fuel metering jumps from 5-0-10-0 while it surges also the tps or pedal volts are .67 at idle... i wont be able to check anthing else till friday, heading out on the big road to make $$ wont be back home till friday...

1. Does the engine crank, or 'turn over'? yes
1a. Does the engine start and run?yes
1a1. If the engine does not start - Crack injector line (http://www.dieselplace.com/forum/showthread.php?p=2188140#post2188140): do you have fuel?
1b. Do you have a Wait To Start Light & the amount of time (seconds) lit. 10 seconds give or take
1c. Ambient Condition (temperature outside indicate F or C) _40____ °
1d. Engine Cranking speed (if you have an accurate tachometer).???
1e. Are you experiencing stalling? no
1f. If Stalling, describe (upon startup only, down the road, hit a bump etc)
1g. If Stalling, do you notice loss of dash or instruments?
-note if experiencing stalling,you must indicate PMD location in #24.

1h. Check turbo inlet and air filter for obstructions. Cone filters have lost disk and stopped air to turbo. almost new
1.1 Lift pump test (http://dieselplace.com/forum/showthread.php?t=39350)- describe results working not sure of pressure
2. Service Engine Light while running?- never
2a. Service Engine light does glow during start/cranking/bulb check: Yes
3. Model year 1994
3a. Odometer reading (indicate if in miles or km) 171,000
3b. Miles on major engine components if been replaced (example Injection pump) previous owner stated pump was changed recently
3c. Indicate the model number on the Injection pump (starts DS4 or DB2......) db2
4. Have you scanned for engine codes? (varies by pre/post 96) yes
5. List exact results on engine codes (http://www.dieselplace.com/forum/dtc.php): 68 (historical)
6. Air Filter condition (visual check) decent
7. Fuel filter condition (freshly changed/condition unknown/mileage since changed) changed today
8. Condition of Battery terminal connections (removed, cleaned and tightened) clean and tight
8a. Known condition and age of the batteries. decent
8b. Are batteries of differing age or are they a matched set? matched
8c. Condition of Major Grounds (http://www.dieselplace.com/forum/showthread.php?t=157085). (same drill as batt - removed, cleaned, retightened) clean
9. Upon cold start, does the radiator hose get hard quickly? no
10. Upon cold start, do you have excessive white smoke? no
11. Do you have excessive cranking time before the engine starts? no
12. Have you used the block heater, and does this effect engine starting?(only try for starting problems)
13. During hard acceleration, do you have excessive black smoke? no
14. Do you have any unusual exhaust smoke issues? a little extra on hard excelleration
15. Turbo check out (http://dieselplace.com/forum/showthread.php?t=39368)- pass 9psi boost
16. Do you have an EGR on the engine? (An F or an S engine code 8th VIN digit)no
17. Indicate if you know if it’s a 3500
18. Indicate fuel that you are using: Bio-diesel, #2 Diesel, #1Diesel, SVO/WVO, other diesel
18a. If running a VO (Veggie Oil fuel) setup, indicate details of your conversion (homemade, or packaged system)
19. Are you using any fuel additives? If so, please list. lucas
20. Please indicate geographic region you are in: (example: Texas or Canada) new york
21. Do you have any service history available that might pertain to the problem you are having? the extension harness i bought had one loose pin i had to reinstall
22. Please indicate any modifications to the vehicle that might help us diagnose better. manual waste gate, strait piped, 1.94 tdco,
23. Upon unscrewing the fuel cap (http://dieselplace.com/forum/showthread.php?t=42338), do you have a large vacuum formed in the tank? small hiss but tried leaving the cap off while running no change
24. Location of PMD/FSD (http://www.dieselplace.com/forum/showthread.php?t=39436)? On the pump/remoted over intake/remoted out of engine bay (please specify placement specifically) behind bumper
24a. If remote mounted, describe wiring harness (homemade or purchased from a vendor?) edam harness
24b. Indicate the location and condition of the FSD/IP grounding wire. ??
25. Are ALL glow plugs in proper working order as per this thread (http://www.dieselplace.com/forum/showthread.php?t=39182)? all glows are new 60g's

I also have an idle surge, but only when i use fast idle, and only cold mornings. if i let idle normally for 2 or 3 mins & then switch to fast idle, it works quite well.

Air in the fuel system? Leak, OPS or LP or both not working properly (you said it is working).

lp was working when i jumped it to refill the fuel filter... didnt check actual pressure though... ops may be bad? but it has plenty of top end power when warmed up kinda makes me think something else... but the fuel connections were a little loose for my taste... so i tightend everything up... we'll see i doubt thats the problem but you never know

just spoke to the previous owner he has some parts in his garage for the truck lp is one of them he's gonna give me it and what ever else he has tomorrow... so gonna change the lp this weekend... and i'll check the ops too hopefully that will fix it...

so far i've changed the lp checked the fuel pressure (5.5pds) ects (that seemed to help) but ice cold start no change... tried retightening no surge since but its warm now... i'm now getting some tps codes but we'll see where that goes... fixed some fuel leaks (rotted return line) water drain leaking

well its come down to changing the ip so i bought a new stanadyne unit today from a local pump rebuilder (never even knew he was there) made me a deal i couldnt refuse 110 dollars more than his rebuild pumps... and he said as soon as i get the old one out bring it down and he'll test it, if its still good and not the problem just return the new pump for a full refund and keep hunting for problems... so tomorrow is the day... i figure local is the way to go after some ebay mishaps in the past... GRRR!

Too Cool - You can't beat that deal. Be really nice to that guy!

the ip was the "wonder drug" for my truck fixed the surge, starting, torque converter lockup,all around drivability! just about every issue! best money i spent on this truck thus far!!! as for my experience with the diesel shop by my job great guys very helpfull havent had service like that in years! anyone with an ip issue near queens ny i will reccomend them just pm me... now the only issue is power is down from the old pump. so i need a chip probably gonna go heath just dont know which one???