How do you know if the throttle is dirty?

The following is about dirty throttle: 1. The idle speed of the vehicle is a bit wobbly, especially when it is just ignited, and the engine jitter is obvious, indicating that the throttle is a bit dirty. 2. If you feel weak in acceleration when driving, it is not as smooth and fast as before, indicating that the throttle may be dirty. Of course, it may not be that the throttle is dirty, or there may be something wrong with the oil circuit. 3. If you feel that the fuel consumption increases obviously when driving, eliminate the problems such as vehicle overload and long-term low-speed driving, which may be that the throttle is dirty. The following information is about cleaning the throttle: 1. When cleaning the throttle, it is not necessary to disassemble it, but the sealed part of the air inlet must be cleaned, and the idle motor must be disassembled to clean it. Borrowing and disassembling methods to clean the nozzle have their own advantages and disadvantages. Under normal circumstances, the maintenance station suggests not to disassemble and wash to prevent other unnecessary waste. 2. Note that most cars are electronic throttles now. The accelerator should be reset after cleaning, otherwise the car will shake badly.