Why is the throttle idling unstable when there is carbon deposit?

The throttle affects the idle speed of the engine, mainly because the throttle controls the air intake of the engine. When the throttle valve is too dirty, the air intake of the engine cannot be accurately controlled, which leads to repeated adjustment of the air intake by the throttle valve and unstable idle speed of the engine. Therefore, it is recommended to clean the throttle regularly, preferably every 20,000-40,000 kilometers, so as to avoid the dirty throttle affecting the idle speed of the engine. If the engine idling is unstable, it is likely that the throttle is too dirty. In this case, it is best to try to clean the throttle first to solve the problem.