When you turn on the a/c, the pump creates an extra load on your engine it has to deal with.
Usually it's no problem. But if your ignition system/fuel system isn't in proper tune, it won't be able to handle the extra load.
First do a tune up if you haven't already done so. Also, check the fuel pump. (Pressure test)
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Monday, September 20th, 2010 AT 5:53 AM