Used your site to figure out the orignal problem of stalling. Replaced PMD and moved to bumper. Ran fine for 200 mi and now the rpm drops down to an idle and there is no pedal response until you shut it off and restart it. I was going to moved the PMD back up to orginal wiring harnes temporarly to be sure ext harness is good. Has new ops and there is good flow from lift pump. Sometimes ther might be a surge and then its down to an idle. And it does this driving. This is a great site and I hope someone has an Idea.

0. Describe in detail the problem you are having. Please be as descriptive as possible.Changed PMD W/Dtac moved to
bumber. Ran fine for 200 mi. Now it randomly will drop down to an idle no response to pedal, shut it off and restart
and will run fine until it does it again.
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: do you have fuel? Yes
1b. Do you have a Wait To Start Light & the amount of time (seconds) lit. YES
1c. Ambient Condition (temperature outside indicate F or C) ____N/A_ °
1d. Engine Cranking speed (if you have an accurate tachometer). UNKNOWN
1e. Are you experiencing stalling? uSED TO/ REPLACED PMD
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.
1.1 Lift pump test - describe results wITH ENGINE RUNNING THERE IS GOOD FLOW WITH NO EFFECT ON ENGINE
2. Service Engine Light while running?- on/off/intermittent OFF
2a. Service Engine light does glow during start/cranking/bulb check: Yes
3. Model year 1996
3a. Odometer reading (indicate if in miles or km) 164000
3b. Miles on major engine components if been replaced (example Injection pump) unknown
3c. Indicate the model number on the Injection pump (starts DS4 or DB2......) UNKNOWN
4. Have you scanned for engine codes? (varies by pre/post 96) yes
5. List exact results on engine codes: NONE
6. Air Filter condition (visual check) NOT SURE
7. Fuel filter condition (freshly changed/condition unknown/mileage since changed) CHANGED THREE TIMES IN LAST 400 MI
8. Condition of Battery terminal connections (removed, cleaned and tightened) NO
8a. Known condition and age of the batteries. NOT SURE CRANKES FINE
8b. Are batteries of differing age or are they a matched set? NOT SURE
8c. Condition of Major Grounds. (same drill as batt - removed, cleaned, retightened) NO
9. Upon cold start, does the radiator hose get hard quickly? NO
10. Upon cold start, do you have excessive white smoke? Yes/no 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) NO
13. During hard acceleration, do you have excessive black smoke? Yes/no NO
14. Do you have any unusual exhaust smoke issues? NO
15. Turbo check out - pass/fail PASS
16. Do you have an EGR on the engine? (An F or an S engine code 8th VIN digit) UNKNOWN
17. Indicate if you know if it’s a 1500, 2500, 2500HD, 3500, 3500HD. 3500
18. Indicate fuel that you are using: Bio-diesel, #2 Diesel, #1Diesel, SVO/WVO, other #1 & #2
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. DEISEL KLEEN
20. Please indicate geographic region you are in: (example: Texas or Canada) OHIO
21. Do you have any service history available that might pertain to the problem you are having? NO
22. Please indicate any modifications to the vehicle that might help us diagnose better. NONE
23. Upon unscrewing the fuel cap, do you have a large vacuum formed in the tank? Some ????
24. Location of PMD/FSD? On the pump/remoted over intake/remoted out of engine bay BUMPER MOUNTED
24a. If remote mounted, describe wiring harness (homemade or purchased from a vendor?) VENDOR SUPPLIED
24b. Indicate the location and condition of the FSD/IP grounding wire. IP/ GOOD CONDITION
25. Are ALL glow plugs in proper working order as per this thread? APPEARS TO BE OKAY/ STARTS EASY

any codes?......Maybe the pedal assy.......

Start with cleaning the grounds.Many wierd problems are caused by this.Be shure to get the ones on the back of the intake manifold.There is also one going from the frame to the firewall that is by the exhaust pipe on the passenger side of the engine[sucks to get to]Clean all connections thuroghly with wire brush or my favorite fine emery cloth. Apply dielectric grease after put back together to prevent future corrosion.You may luck out and thats all it is and its free,except the grease.When you get done with that take a minute to fill out your signature[top right by your name clicl on user cp and go to edit sig.] It will help us help you.

tps is going bad , mine played around like that for a while then stopped alltogether ,had to change it ,works great again

Well I think I got it figured out. I drove the truck for 35 mi without a problem. Stop at an auto supply to get a TPS sensor. Went to take off and it started to surge and buck smoke rolling finally dropped to an idle with no response to pedal. Shut it off waited a few seconds and started it and it ran ok for a few hundred feet ended up doing it 2 more times before it started to run right, drove it 7 mi home. Popped the hood and was checking out wiring around the IP when I touched the PMD/EXT connector. The engine surged smoke rolled and if I wiggled it enough it would die. I did this 3 times to make sure it was'nt a fluke. Pulled conn apart and 1 pin was 1/8 " shorter than the others I tried to trim conn body back but it did'nt take much for the plug to slip back and stall engine. So I removed PMD from bumper and pluged it back into main harness. Afterwards no matter how much I wiggled or twisted it there was no affect on the motor. So I'm going to make a bracket to mount to intake until I can get a new harness.

I guess I failed to mention that this truck belongs to a neighbor who dos'nt under stand electronics only slightly less than I do and I don't know much. I'm afraid if I told what I drove I would get black balled off this site.
But what the heh Your a great friendly bunch. Surely you won't hold it against me if I drive a 1990 F250 rustbucket, 248,893 mi, 7.3 deisel,Ford turbo added at 180,000 mi, blown head gasket oil in Radiator, enough blowby to steam a potatoe in 10 min. probably cracked heads. But it still gets 17 mi to gal. Thanks for all the great info and maybe my info will help somebody someday.

Nobody would hold it against you, we're all a bunch of IDIots. ;)

Yes, it happened to some of the extension harness.

Where did you get them? I hope it is not Edam.

I hope it is not Edam.

No offense: I hope it is Edam... One bad vendor is one too many. What if there are a bunch of guys out there selling bad extensions????