What happens when the throttle of Fengyun 2 is dirty?

Chery Fengyun 2 Release the throttle and then step on it. Loose steering wheel means that the throttle is dirty or the throttle is out of order, which will lead to idling jitter. The main reason of dirty throttle is that there is carbon deposit at the joint between throttle valve plate shaft and throttle body, which leads to inaccurate throttle opening, so the idle speed will shake.