The classic Sylphy high-speed throttle is shaking and the sound is too loud.

When the engine is empty, the noise at high speed must be very loud. Carbon deposit, spark plug, intake pipe. Intake sensor, three-way catalytic converter and long-term oil change are all possible. Under normal circumstances, as long as it is cleaned up, there will be no problem. If it is an oil problem, replace it in time. If the air filter and steam filter have not been replaced for a long time, it is better to change one.