Engine/Transmission (1998.5 - 2002) Rough running

[RodMorris]

My dad has a 2001 3500 that he bought wrecked and salvaged. It only needed some body work. He's been driving it - went on a trip from OH to MT, and just came from OH to see me in NC. He's had a problem with it occasionally running rough and having no power. He thought it was problem with low lubricity in the fuel because it would smooth out if he added a quart of oil to the fuel tank. Now, though, it looks like it's really a rough road issue. It runs fine if the road is smooth (new pavement) but rough roads (even highways) make it miss and lose power. He did add a fuel pressure gauge and the pressure doesn't drop, which seems to rule out a lift pump issue or pinched fuel supply line. Any thoughts on what the problem may be?

 

[DFerverda]

I would start out looking at the cheap fix.
Check the batteries, and clean all the grounds and terminals and motor/body grounds, and reset the apps.
Check the intercooler and boots.
And make sure you have a fresh fuel filter.
Once those are out of the way if it still does it i would start lookin at the map, and iat sensor.
Good luck
Dirk

 

[monkeyman]

If it is a automatic, change the speed sensor on overdrive housing. Does not throw any codes and makes truck run like crap. Autozone has it for $13. 00, life time warranty Mimics bad VP, etc.
Rick