The recommended idling speed is 720 to 820 and 900 is already too high. You have aproblem with the idling circuit and you need to
1. Clean the throttle body.
2. Clean EACV (Electronic Air Control Valve.
3. Check the valve clearances. If insufficient clearance, it wll tend to drop before going back up.
Sunday, October 26th, 2008 AT 5:00 AM