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unplug the IACV on the intake manifold and set the idle with that disconnected. it will give you a check engine light while it's disconnected. either clear the memory code, or remember that it's there once you get the IACV plugged back in. my car was idling like that for a while. it was actually set to idle too high. also check your coolant level and your coolant temp sensor. the ecm looks at coolant temp when it determines idle speed. if your coolant is low or the sensor is bad, the ecu will get pretty confused and do strange things to your idle.
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