Hello & Welcome to JA,
If you would give me the VIN # XXXXX identify the platform this vehicle is built on,I believe I can help you.
The vin # XXXXX XXXXX Thanks for your help.
Ok, if I understand you correctly, the Electronic throttle actuator control module , throttle body assembly have been replaced.
This problem I see a lot of harnesses about a foot or two from the throttle body with broken wiring which causes an intermitten condition. These are low voltage circuits & it does not take much to add a small amount of resistance which will give the PCM an incorrect reading of commanded & actual position of the throttle. I suggest you ohm the wires from the PCM,to the TAC to the APP. Here is a schematic to help .
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