I'm asking for a friend because I can't figure it out. It's a v6 2000 auto. Throws a tps check engine light. We have replaced it 3 times 2 motorcrafts and one autozone special and the motorcraft make the car run like crap. The autozone let's it run beside the bad gas milage. The check engine light will come on and off. Full tune up was done and the gas milage is tops 14. Any ideas?