The A/C places an extra-heavy load on the engine, so if you have a problem that gets worse when A/C is on, then that's par for the course. However, I don't suspect the the problem is caused by A/C.
I would take a look at the oil pressure sender. That's one component that needs to be accurate.
See if your car has set a code. Has the check engine light turned on at all?
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Wednesday, September 26th, 2007 AT 6:57 PM