Solution: Fei Xiang started the idling unstable flameout.

Dirty throttle (hindering normal opening and closing, affecting intake air volume and air-fuel ratio); Excessive carbon pollution in the combustion system (intake valve, spark plug, in-cylinder and combustion chamber) absorbs fuel and reduces combustion quality and power performance; There are too many deposits and colloid in the oil supply system (oil circuit and nozzle), which affects the fuel injection quantity and fuel atomization effect; Abnormal performance of oxygen sensor (too dirty, leading to ignition