alright guys a have a question.. its a doozy.. my car was running like crap. i changed the ignition boots, the fuel filter, and spark plugs and it didnt do the trick.. my coil packs worked fine. then i decided to change the TPS sensor. that fixed the problem. the car runs like a dream. but when i go to start it up again it shoots me the "Service Engine Soon". the code is from the TPS. but when put on my old one the car runs like crap but the service engine soon light doesnt come out. now the TPS i got is from my friends 03 GT... Now both cars use the same TPS. by that i mean they're both the same part Number. my question is.. Why does the service engine light come on when i use the good TPS? and my ****ty TPS doest give the Code