Chery A3 idles slightly.

Four reasons: 1. The most common cause of serious engine carbon deposition leading to vehicle jitter is that the throttle valve is too dirty or the injector has too much carbon deposition. When there is too much carbon deposit in the engine, the gasoline sprayed by the fuel injection head will be absorbed by the carbon deposit during the cold start, which leads to the lean mixture during the cold start and makes it difficult to start. In this case, only when the gasoline absorbed by carbon deposits is saturated can it easily enter the car.