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What I find odd here is that you're only having the problem in Park and Neutral.....usually with a bad IAC or TPS you'd see the problem show up in gear when there's a load on the engine. I would try to get a scanner on it or at the least check your TPS voltage and possibly try cleaning the burnoff wire for your MAF.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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