What are the symptoms of dirty throttle?

Symptoms of dirty engine throttle are: 1. When a car refuels, it will feel that the throttle is stuck and heavy, and the speed is slow. When you step on the throttle, the speed will rise slowly and the response will be 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. Generally, the cleaning cycle of the throttle valve is about 20,000 ~ 30,000 kilometers. But it also depends on the condition of the car and driving habits. If the road conditions are not good during use or you often drive at a low speed, you need to replace it in advance.