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

The causes of engine jitter after cleaning the throttle are: 1, idle reset learning; 2. When cleaning the throttle valve, the throttle valve is forcibly opened, resulting in damage to the stepping motor. The steps to clean the throttle are: 1, open the hood and find the throttle of the engine; 2. Remove the air filter and intake pipe with a flat screwdriver, and unplug the electric socket on the throttle; 3. After removing the screw, remove the throttle, and then block the air inlet of the engine with a dry rag to prevent dirt from entering the engine; 4. Spray the throttle with detergent. Throttle is a controllable valve that controls air to enter the engine. Its function is to control the air to enter the engine, and the gas will be mixed with gasoline into a combustible mixture after entering the intake pipe, so that the combustion is successful.