how can make the rpm lower it wont pass the smog test. It running alittle above on 1991 Lexus LS400

idle is to high

by in Corona, CA on April 05, 2012
1 answer
ANSWER by , April 05, 2012
POSSIBLE VACCUM LEAK OR BAD IDLE AIR CONTROL VALVE. THROTTLE BODY MAY BE ALL CARBONED UP