What happens is when you turn the a/c on, it puts a big drag on the motor. The computer senses this and in turn raises the idle up back to the set rpm. I know it never happened before to you but this is usually caused by the little hole in the throttle plated clogging up from gum. You need to take the intake boot off and clean the trottle plate off with some gum cutter or other carb cleaner. Gaurentted to fix your problem. also it wouldn't hurt to check the airfilter.
Hope this helps you
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01' Black GT
2 chamber Flows Mach 460, Leather 17"thrust wheels, bassanni x-pipe with cats, BBK Cold Air, Steeda pullies and timing adjuster @ 13*, Steeda Satin Shift Knob
Tri-ax shifter A pillar Double gauge pod, Auto meter White Phantom Gauges Fuel Pressure and Vac, Richmond 3:73's
Steeda Subframe Connectors.Strut Tower Brace
13.41 @ 102.1mph
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