Abnormal idling noise after replacing throttle valve.

The throttle line is leaking. After the throttle is cleaned, there is a buzz when the vehicle shifts gears, which is the reason why the throttle pipe is not installed correctly and there is air leakage. 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, and the combustion is successful.