Is the cold car idling?

The reason of idling jitter of cold car is 1. The most common reason is that the throttle is dirty or the throttle fails, which will lead to idle jitter. The main reason why the throttle is dirty is that the throttle opening is not accurate, and the idle speed will shake because of carbon deposition at the joint between the throttle valve plate shaft and the throttle body. 2, so we can clean the throttle first. If it doesn't shake after cleaning, it means the throttle is dirty. If it still shakes after cleaning, it may be that the throttle assembly is damaged and needs to be replaced. 3. Reminder: Because all vehicles now use electronic throttles, it is necessary to learn the idle speed again after cleaning the throttles.