Help: Is the idle speed of Chery qq3 unstable?

The phenomenon of your car may be that the throttle is dirty, and the signal of the throttle position sensor is not accurate when the oil is returned to idle speed. When idling, the throttle should be 0 degrees. If the throttle is dirty, which hinders the return of the throttle, the signal of the throttle sensor fluctuates constantly, as does the signal to the engine. The ECU of the engine will constantly adjust the steps of the idle stepper motor to control the engine speed at idle speed, which will lead to the failure of unstable idle speed. Suggestion:

1. Clean the throttle and idle stepper motor.

2. If cleaning doesn't work, you should go to the 4S shop and use a special diagnostic instrument (X-43 1) to see if the data flow is normal. If the throttle signal still fluctuates, it is necessary to consider replacing the throttle body or throttle position sensor.