I just had the fuel pump replaced and fuel filter. Picked the truck up left right when it got to about 2500-3000rpm it started hesitating... then put my foot to the floor itll kick down and just detonate and miss wont go anywhere... if i am accelerating i have to keep it under 3/4 throttle and 2500-3000rpm to get up to speed. I have now replaced the plugs, fuel pump fuel filter and MAF. i dont see any rips or tears in the pcv hose, the pcv also still rattles when i shake it... im stumped.... really need to figure this out thanks

 

Did you go back far enough to check the pcv elbow too. That's the first place a vacuum leak normally starts, prompting that code.

 

Well i dont see where it goes back persay i see the pcv and the hose that connects to the plastic elbow then intake plenum butits not under the plenum on my truck

 

Not sure if w're talking about the same elbow. Mines rubber, not plastic but that was in 1999. Maybe upgraded by 2003?
I'd continue to look, hear, or just find a vacuum leak. Most likely why it is pulling that code.
Good luck.

 

yeah its different on an 03 they changed it. i pulled my injectors today cleaned all of them, took my coils off and cleaned them all up including the boots, ohm tested all the coils im stumped... all i can think now is the pump i bought is bad.... but the shop said they ran it on their analyzer and is said all fuel pressures were good... so im stumped...lol

 

And you did change the fuel filter at the same time I hope?

 

Check you catalytic converter for blockage..