What is the reason for the unstable idle speed of the air conditioner?

The throttle valve is too dirty, and the fuel injector has too much carbon deposit. After a certain mileage, a dirty throttle will cause the throttle to close loosely or the idle stepper motor to get stuck, both of which will lead to high engine idle speed. The carbon deposit produced by the engine during the working process will also cause vehicle jitter, especially when starting the vehicle, the engine jitter will be more serious than normal, and it may even not be started at one time. Therefore, when the vehicle is shaking, first check the throttle and throttle. If the throttle valve is found to be too dirty or the fuel injector has too much carbon deposit, it should be cleaned in time.