Intake manifold in the throttle and engine intake valve between the intake manifold is the carburetor or throttle body to the cylinder head intake tract before the intake pipeline, the period of use is the air, fuel mixture from the carburetor or throttle gas distribution to the cylinder intake tract. Maintaining safety on the road

So that the engine carbon deposits increase. When the situation is serious, the engine will appear strange noise, idle speed increases, starting difficulty, acceleration is weak, driving in the stalling and other symptoms