[dhbgl1800]

Originally Posted by SpLaT

could be bad injectors, hows the oil level... are you seeing the level going up? ( leaking injector) pick up one of those infra red tempature guns at any good auto part store. get your truck up to running tempature using the temp gun shoot each exhaustport on the exhaust manifold. they should be consistant tempatures if you see a colder exhaust ... that injector is hooped.

also check out the FCA = fuel control actuator on the back side of the CP3 injection pump, famous for sticking causing rough idle/poor pefromance.

if you do find an injector or mor colder then the rest, I would sugest taking it to a good local diesel shop for remanufactured injectors alot cheaper then what the dealer is going to charge. thats if you are unable to do the work yourself.

could also be the lift pump, but the way its acting most likely not as the injection pump has enough jam to run the engine well enough where its not acting like yours. (GM duramax use same injectors and injection pump as the cummins but they don't have a "lift pump" like we do)

picture of where the FCA is??