Probably a sticking Iac Air Control motor. It sits on the throttle body and has a 4 wire connector.With the engine running you can unplug the sensor(the check engine light will set) but the idle should drop real low. If it stays the same, the motor is sticking, you can try removing and cleaning the valve and the passageways on the throttle body with carburetor cleaner. Otherwise it will need replacement.
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