What is the performance that the throttle needs cleaning?

The performance that the throttle needs to be cleaned is: unstable idle speed, difficult starting and decreased power. Throttle is a controllable valve that controls air to enter the engine. It connects the air filter and the intake pipe of the engine, and is called the throat of the automobile engine. There are two kinds of throttles: traditional cable throttle and electronic throttle. The traditional engine throttle control mechanism works by pulling a cable or pull rod. One end of the cable or pull rod is connected with the accelerator pedal, and the other end is connected with the accelerator linkage plate. Electronic throttle mainly controls the opening of throttle through throttle position sensor and throttle motor, so as to adjust the intake air.