Im going to chime in here and I hope I dont come across like an ass. First off, I have been there and done that with these cars for over 10 years and the biggest thing I have learned is that all the bolt on parts are a waste of money and in the long run, they just make your engine run worse then the factory intended it too. The biggest culprit is the POS Eproms on the market. It is impossible to order a Eprom for your car and get the calibration correct over the phone or by filling out a tech sheet. I have 3 eproms here in my house that are JUNK and 2 of them are from Fastchip that I paid $350 each for back in the day.
Second, replacing OEM parts like sensors with the junk found at your local parts store is just asking for trouble. You will not catch me dead buying anything for my car in those places. I have learned the hard way that the sensors they sell are no where close to the quality of a new AcDelco part. You may not see a change by just replacing the TPS or even worse the O2 but a little here and a little there makes a huge difference at the end and now the engine is not running at its best because of little issues here and there.
I highly suggest you first get your car running correctly with the stock emprom and stock parts or you willl just be chasing your tail. I have never seen your car and I dont know anything about the mods done so please fill me in so I can offer my help to you. If your car is straight and clean and not far from stock and I would leave it alone and enjoy what you have because they are getting harder and harder to find in nice shape.
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