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it sounds like your low on freon. the idle kicks up to comensate for the extra load from the compressor . if its low on freon the compressor short cycles causing the eratic idle

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Q: 1999 Mercury Mystique with 70000 miles When you have the ac on and you are sitting at a light the rpm gauge goes from 600 to 800 every time the compressor clicks on Is this normal?
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