I had this condition once.... and I thought something serious was amiss.... however, after getting home and parking the car.... was still idling near 2000 rpm. After I turned the car off and started it back up, all was fine.... haven't had that happen since... My guess is a momentary lack of concentration on the computer's part....
If it is a continuous thing... try replacing computer... or disconnect battery for 5-10 minutes, and retry...
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