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Just a suggestion, but try a new IAC. Sounds a lot like a problem I was having. Do you have access to HP Tuners? That can help lead you in the right direction.
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Mike
Red 98 Z28
TGMS A4, 224 Cammed LQ9, Borla Catback, MSD wires, Summit 3.73 gears
12.06 @ 113.04 mph 1.66 60 ft
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