What happened to the old overbearing 4 thousand idle speed?

Overbearing idle speed is high, first consider whether the throttle has too much carbon deposit, and then look at the injector. If there is no problem, you need a computer to match the data! The idle motor is damaged, and the opening of the ventilation valve cannot be adjusted, resulting in the inability to control the appropriate air intake. The fuel injection nozzle is blocked, or the oil pump is out of order, resulting in the inability to control the appropriate fuel injection quantity. Throttle failure, air leakage, resulting in the inability to control the appropriate intake air.