Autozone will check for free.
I have a strange A./C rpm problem also. When I am coming to a stop, say to go up my driveway and I turn the A/C knob to off, my rpms sore to 2,000 and my car wants to take off on its own. Lasts like 10 seconds then goes back to idle. Has happened about dozen times now, in the past few months.
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2002