Ok here's and update. I m getting codes P0171, P0174, P0300 and P1574. After going back through the whole system and not finding anything, the replaced all o-ring on the intake housing, reseated the new intake gaskets with no vacuum leak at all, I tested them and then I had a pro check them and no leaks. My fuel pressure is at about 54 psi with keys on (Eng not running) with Engine running it drops to about 50 psi, so good fuel pressure for my truck (VIN T ). I ve replaced upstream O2 sensors, MAF, TPS, PVC valve, Fuel pressure regulator (twice), Fuel pump, and Fuel filter and cleaned the fuel injectors. The truck wants to just take off it has a high idle and runs rough and seem like it wants to just die, but it doesn t and it only does this at idle or when your stopped for a period of time such as a red light. Truck runs great at speeds with not issues. When I disconnect the MAF everything run great. Still need help!
Or the fuel trim sets at 25 for both sides.
Tuesday, October 9th, 2012 AT 4:26 PM