What's the matter with high idle speed when the throttle doesn't return?

The throttle is out of order The reason why the throttle does not return to its original position and the idle speed is high is that the dirty throttle will lead to the opening error of the throttle, the sensitivity of the throttle will be reduced, and the throttle cannot be closed normally at idle speed, resulting in abnormal idle speed, which belongs to the throttle fault. Throttle, also known as "throttle" and "throttle", refers to the control device that controls engine power (thrust).