99 ram 2500 w cummins

[kristinmunson]

The tack jumps around and it runs sluggish when running down the road. When I start it in the morning it runs fine for a while but it gets worse after about 20 miles of driving. It wil also die when ideling. Any ideas?

[funcruise]

For the sluggish part the first thing that comes to mind is when was the fuel filter changed? See if you can find someome to check the lift pump pressure. [the electric pump between the tank and injector pump] This is critical as if it wears out and low or no pressure it can take out your injector pump [$1500.oo or so] Also check for codes....Not sure about the tach jumping though......Is there white or blue smoke on start up? White smoke indicates there could be air in the fuel lines from a leak somewhere. It wont show a drip or anything as the fuel is sucked through the line instead of being pushed. Does it smoke when driving? Black smoke when going down the road could be a leak at one of the fittings on the pipe from the turbo to the intercooler or to the intake manifold....If not any of that...take it to a garage that has a GOOD diesel mechaniac......