What are the symptoms of dirty throttle?

The symptoms of dirty engine throttle are: 1. When a car refuels, it will feel that the throttle is stuck and heavy, and the speed will be slow. When you step on the throttle and idle, the speed will rise slowly, and when you release the throttle, the speed will drop immediately. 2. The unclean throttle will affect the accuracy and smoothness of engine intake. One of the most obvious problems is that idling may cause jitter or even flameout, and the throttle speed is not stable. Content expansion: 1. The main reason is that the air intake filter in the vehicle environment can not filter the surrounding dust well, which will lead to dirty throttle. 2, the variety of oil is not good, evaporation will lead to dirty throttle. 3. The generation of oil vapor and impurities in the crankcase will lead to dirty throttle. 4. It is impossible for the throttle to inhale some dust tightly after the flameout, resulting in the dirty throttle.