What are the manifestations of dirty throttle in automatic transmission cars?

Dirty performance of automobile parking accelerator: 1. Dirty throttle is the first sign. The idle speed was unstable at the start, and the engine speed dropped to 500 rpm when the red light was braked. 2, serious, the car can't move. Cleaning the air throttle valve is relatively simple, and the operation steps are as follows:-Remove the air intake pipe, four throttle valve fixing bolts and two cooling water pipes. -Unplug the plug of the throttle position sensor and remove the throttle body for cleaning. 3. After flushing the throttle, use Nissan special diagnostic instrument for idle learning. Throttle is the most important component in today's EFI automobile engine system. Its upper part is the air filter, and the lower part is the engine body, which is the throat of the automobile engine. Whether the acceleration of a car is flexible or not is also related to the cleanliness of the throttle.