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Do you still have the actual trouble codes?Example P0401?
Did you have this problem before the throttle body and intake was sprayed with the cleaner?
Do not replace the 02 sensors. The codes are from the 02 sensors telling the PCM that the engine is running rich. It could be too much fuel or too little air entering the engine.
It could be the cam phaser or the VCT solenoid for that side. The VCT solenoid uses oil pressure to advance or retard the timing of the camshafts. There is one on each side.
You may want to look at the cam phasers and the VCT housings that the VCT solenoids mount into.
Also, check the camshaft cam caps for scoring. This will also cause low oil pressure to the VCTs and cause the camshaft to stay over advanced.
Cams over advanced, lack of power and stalling.
Check the cam caps also. These are the caps that hold the camshafts to the cylinder heads. Check the underside for scoring. You do not want to feel the scoring with your fingernail.
Also, check the rocker arms (followers) and also the lifters (tappets).
Sorry I have been out of commission getting surgery done to my left arm to get skin cancer removed. Finally got use of my left arm again. But still sore.
We did have problems with the injectors on the 2004 5.4L engine. They could stick open and wash the cylinder down and cause internal engine damage.
Give me the VIN# ***** the mileage so I can check to see if there are any notifications for the fuel injectors.
To me, sounds like they are guessing and not fully backing up their diagnosis. We call them parts changers. If they through enough parts at the vehicle, it should fix the problem.