engine misfire at idle

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  #1  
Old 07-04-07, 03:34 PM
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engine misfire at idle

i have a 1992 buick park avenue with a supercharged 3.8 engine about 143000 miles with the car at idle with a/c on in about 5 to 10 minutes it acts like it not running on all six cylinders turn off the air and drive around it returns to full power any ideas???
 
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Old 07-04-07, 06:34 PM
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Sounds like a failing AC compressor. The compressor is putting more of a load on the motor when it's failing.
 
  #3  
Old 07-04-07, 07:44 PM
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While the A/C does put a strain on the engine.........You're describing a "misfire"???...........Go the basics, check the plugs and wires, but be advised........misfires at idle that go away when under load usually indicate a vacuum leak of some kind..........Any check engine light???......And if so what are the codes???
 
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