Mazda 6, the vacuum tube socket behind the throttle leaks.

The interface between the throttle seat and the intake pipe is leaking. Air leakage from the throttle will lead to unstable idling of the engine. The air leakage in the vacuum tube socket behind the throttle valve in mazda 6 is due to the air leakage between the throttle valve seat and the inlet pipe interface seat, which leads to running after parking, insufficient power and occasional flameout. The leaked part will make the hood black.