What is the reason for the car's cold start jitter and flameout?

The common causes of automobile cold start jitter flameout are that the throttle valve is too dirty or the fuel injector has too much carbon deposit, which generally appears in the inner wall of throttle valve, intake head, intake port, piston top and combustion chamber. Excessive carbon deposition on the inner wall of solar terms will lead to insufficient air intake, difficult start-up or easy flameout at idle speed. Cold start refers to starting the car when the engine water temperature is low. When the engine temperature is normal, the engine can be successfully started several times in a row, indicating that the battery is in good condition. When the engine speed gradually decreases, it needs to be charged in time. It is beneficial to pay attention to the detection and maintenance of the battery when the car can be started.