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I'm sure they checked your idle speed and found it to spec too. No worries unless it happens again.
But it occurs to me.
Do you live close to school?
Was it cold outside?
Was the car cold (<150 degree F engine coolant temperature)?
Then you might want to check the intake air bypass control thermal valve and the vacuum hoses that connect between it, the intake manifold, and the far side of the throttle.
-mr. bill
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