What is the cause of engine jitter after cleaning the throttle?

The causes of the throttle engine jitter after car cleaning are: 1, the air intake motor is damaged; 2. The air intake control function of the throttle valve is invalid. 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, which will be burned to do work. The method of cleaning the throttle valve is: 1, turn off the ignition switch and remove the negative electrode of the battery; 2. Dismantle the throttle pipe, air inlet hose and the screw for fixing the throttle valve in turn; 3. Clean the throttle with cleaning agent, and wipe the parts that cannot be cleaned with cotton thread. The reasons for dirty throttle are: 1, poor filtration of intake filter element and heavy dust in the surrounding environment; 2. The quality of engine oil is not good, and the evaporation is large; 3. Oil, gas and impurities will be produced in the crankcase.