Yup I'd say low on freon as well. If you'd said it did it all the time I'd suspect a bad IAC sensor or something of that nature...but if it's only with the AC on have someone throw some gauges on it.
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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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