I have a 1995 Chevy Corisca. When I have the a/c on the car doesn't acclerate. When you step on the pedal it hestaites. And sometimes it does nothing. Doesn't go. Doesn't rev-up. But when you turn the car off and restart it, it works fine for a couple of mins. And then does it again. But when the a/c is off it works fine. Please help me.