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On the way to work this morning, I was in 5th gear at 45mph, I let off the throttle and it didnt slow down stayed at 45. when I pushed the clutch in the engine revs went up about 500, then dropped to normal. this truck is starting to drive me nuts

yes the throttle goes all the way to the stop, went to the cummins repair shop, he said that if the lift pump goes bad the engine will stop running altogether, so now I am going to try the afc screw, I really hope I dont screw it up.

I put a temporary boost gauge on it. never gets above 9lbs. 4th gear floored rose to 9 then dropped to 8, at 55 mph holds steady at 3

It doesnt shut down quite like the olds. A little faster perhaps. how do I adjust the AFC? could the turbo be bad? I was thinking of putting the 16cm on it, that seems to be the one for the way I am going to use it. Drive to work empty, tow the car. (7,000lbs) once in a while.

I dont have a boost gauge yet am going to be installing one when the weather gets above 30. and how and where do I get one (even temporary) for $15? ok, Laingsburg, MI sounds like a diesel. (it rattles) :) It was in 5th gear, when the speed went below 55 I shifted to 4th still wouldnt go...

I changed the fuel filter, checked the air filter, and all the fittings on the intercooler, still the same.

I just bought a 93 D350 5sp 3. 54, 174k. I tried to pull a 3500 lb trailer. I could'nt get the truck over 55mph. Any Ideas as to why? What can I check? Thanks