Ok last night I was driving home and fro about 40 miles on the freeway doing 70mph no problem. When I get into town and I would let off of the gas pedal my truck would die. I turn the key off and back on and the wait to start light would come on about six times and I could here the lift pump working and it would start right up . I would drive for a few more minutes and the same exact thing, it only seemed to happen at low rpm's. Going up a hile and floored it was fine. I have new OPS,PMD,Lift Pump, New Batteries and good connection, fuel filter changed about 3,000 miles ago. I had just filled my tank and I use some Standyne Fuel Lube formula. And I always use it.

How many rpm's at idle?

Is it only when pressing on the brake?

Any engine codes?

Transmission shifting OK?

Check the fan clutch.

Take the belt loose and check all of the accessories and see if any are hard to turn.

About 750 TO 1000 RPM's. It seems to die if I press on the gas or if I just let off the pedal. Trans shifts ok. No codes. I'll check the fan and accessories when I get home. I bought a new PMD harness and checked the torque on the PMD. Also have new Marine Injectors I'm putting in.

Driving along at highway speed in OD try to press on the brake while holding the accelerator steady. Watch the tach and see what the rpm's do.