I have an 89 IrocZ G92 305, 5pd and when I start it up, it sometimes revs up all the way to 2grand and back down to 750 and up to 1500 then to normal. Sometimes it stays at 2000 for a while then finally goes back down. Other 'rocs I've rode in don't do this. Could it be the TPS sensor or what? I don't think it is normal.

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1989 Iroc-Z. 305TPI 5spd, G92 (230hp/300ft/lbs). 91-92Z28 groundeffects. Corvette Admiral Blue Metallic paint. Thermomaster chip, 160*stat & fan switch, Bosch +4 plugs, MAF screens removed, custom ram air, Flowmaster cat back, K&N, adj. fuel pres. reg.
72,000 miles. SWEET!!

Why is this question in the History/Restoration section? Sounds like an engine question.

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'91 GTA with TPI 350 & T-Tops. Just a few mods, if you want to find out just line up next to me at a stoplight!

Blacksunshine is right. It has nothing to do with history or restoration. This post is being moved to the TPI board.

Willie