What is the reason for the nose jitter of the front fan?

The causes of Feng Fan jitter are: the temperature is too low, and the engine is not fully warmed up and warmed up; Too much carbon deposit in throttle, injector and intake system; Engine spark plug failure. Take Feng Fan 20 19 1.5LCVT Power Pro version as an example. Its power system is equipped with 1.5l inline four-cylinder naturally aspirated engine, and the compression ratio of the engine is 1 1.5 to 1. The body is made of aluminum alloy, and the transmission system is not matched. The 20/KOOC-0/9 model/KOOC-0/.5L CVT Pro version adopts a four-door five-seat three-car structure, with a top speed of/KOOC-0/85 km, an acceleration time of 100 km/KOOC-0/0.2 second, a minimum ground clearance of/KOOC-0/00 mm and a fuel tank volume of 40l. Million car purchase subsidy