What should I do if the idle speed of the car is always high?

Solution to the problem of excessive engine idle speed: 1. Check whether the throttle valve is completely closed at idle speed and whether the throttle cable is stuck. Pull the throttle rocker arm in the closing direction by hand. If the engine idle speed can be reduced to normal speed, it means that the throttle is not tight. 2. If the accelerator cable is stuck, replace the cable; If the throttle shaft is stuck, remove the throttle body and clean it; 3, according to the provisions of the engine program, readjust the idle speed, reset the engine computer. The so-called engine computer reset is to clear the fault memory in the engine computer and let it learn idle speed again; 4. For most electronically controlled engines, when the engine reaches normal temperature and the idle valve is completely closed, the basic idle speed is set to (500 50) rpm. If the adjustment and setting are invalid, further check should be made.