Im not sure if its the same problem your haveing, but I had the same symptoms. The A/C didnt have an effect that I noticed but at random times the car would start idleing really rough and I would get misfire codes on all the cylinders. If I restarted my car it would work fine. It turned out that I had bent valves, and the computer was compensating for the compression by either running rich or lean, but after running for so long it could not compensate anymore and shut those cylinders down. Now Im not sure if your haveing the same problems, i really hope not, it was about $6000 to get it fixed. If you figure it out be sure to post though. Good Luck
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