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Had an unusual idle speed issue today. I usually idle around 800 when the car is cold, and then around 1100 when it gets warm. I pull into the office today and for some reason I'm idling at 1500. I goose the engine, and it comes back down, but then creeps back to 1500. Not sure what's going on there. I'll check it out tonight on the way home, but any thoughts on that?