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Its normal going up the hill but when I crest it there is a surge in power. I believe it is also rpm related. It spins harder on the highway than any other time and that is when the problem is more prevelant. I got the lift pump but have not had a chance to put it on. I also have noticed a...

Replaced the fuel filter today....no change. I ordered a lift pump. Gonna try that next. I hesitate to think its the injector pump because it drives around town just fine. Its mostly on the highway (higher rpm's) that it does it. Any other ideas?

yes it still has the 4.56, I keep it between 55-60. it does just fine......when its running good

no, its a m1008

Literally. If I go over 55 my truck starts to act up. It acts like its not getting fuel but there is a puff of smoke out both sides. If I stay under 45 or so its fine but sometimes wants to die when stopped.... Whats the most likely cause? I wanna fix this pretty quick. Its my daily driver...