My 93 GT (manual) is doing some weird stuff only with the AC on.
Firstly: When I start it up in the morning, it starts fine, and idles fine for a few seconds, then revs up to about 2500 rpm, holds there for 3 or 4 seconds, then drops back to 1000.
Secondly: Under acceleration, it is impossible to get a precise throttle response. If I try to accelerate slowly and smoothly thru first gear, it will go smooth up to about 2500, after which it acts as if I have suddenly stomped on the pedal. Then when I completely let off the pedal, it takes it a second or two before it stops accelerating. It acts as if I still have my foot on the pedal.
Third and finally: At cruising speed (70-75mph) it does not want to just maintain a speed. It wants to be either speeding up or slowing down. If I set the cruise control, it will oscillate between "gas on" and "gas off".
Note that none of these conditions exist when the AC is off!
Any ideas? Thanks, John