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I have a 91 mustang gt, bought it stock and threw a cai on it, everything was good until today I threw a 70mm throttle body and egr spacer on it, shop said my tps was shorted and so he put one they had in parts on it and timed it out right, when I got my car back it had a slow and low startup, when the car is in gear the idle is perfect and it feels responsive, but when in park the idle drops to about 500 and almost dies and then will slowly climb to about 650, and it still has a hard startup, does this sound like the tps is just set wrong?
 

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Is it throwing any codes?


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