What are the characteristics of dirty throttle?

Features of dirty throttle: 1. When a car refuels, it will feel that the throttle is stuck, heavy, and the speed is slow. When idling, the speed of stepping on the throttle rises slowly and the response is slow. Release the throttle and the speed will drop immediately; 2. 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 smooth; 3. The dirty throttle is mainly caused by the vehicle environment, poor filtration of the air intake filter, heavy dust in the surrounding environment, few types of engine oil, large evaporation and other reasons, which are all caused by oil vapor and impurities in the crankcase. After the flameout, the throttle should not be very tight. Inhale some dust, and every little makes a mickle.