What about the jitter of Li Xia three-cylinder idle engine?

Idle jitter should be caused by dirty idle motor or throttle. It is recommended to clean the idle motor and throttle body.

The throttle was washed, the spark plug was changed, and the fuel injector was also washed. The valve clearance is fine, but it still shakes. At that time, because you were looking for a problem in the wrong direction, I suggest you replace the three rubber brackets of the engine. Then check the power output of the generator to see if there is any shaking when the headlights are on. If it is small, change the generator belt, and the generator will not shake when it works normally.