How to judge that the throttle is dirty?

Throttle is a controllable valve that controls air to enter the engine. After the air enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, and the combustion is successful. So how do you judge that the throttle is dirty?

The way to judge the dirty throttle of a car is: when driving, if you feel weak acceleration, idling jitter and unstable idling, it means the throttle is dirty.

Throttle cleaning cycle: generally, it should be cleaned once every 20,000-30,000 kilometers. In fact, there is no strict standard for how often the throttle is cleaned, which has a lot to do with car habits and the environment. If it is dirty, it should be washed.