What is the cause of engine chattering and flameout?

The most common causes of engine start-up jitter and flameout are too dirty throttle or too much carbon deposition in nozzle. The specific reasons are as follows: 1. When there is too much carbon deposit in the engine, the gasoline sprayed by the fuel injection head will be absorbed by a large amount of carbon deposit during cold start, which leads to too thin mixture during cold start and difficult start. 2. In this case, it is easy to enter the car only if the gasoline absorbed by carbon deposits is saturated. After entering the car, the gasoline adsorbed on the carbon deposit will be sucked into the cylinder by the vacuum suction of the engine and burned, making the mixture rich. Engine combustible mixture is sometimes rare and thick, which causes idle jitter after cold start; 3. Carbon deposits usually appear in the inner wall of throttle, intake head, intake port, piston top and combustion chamber. Excessive carbon deposition on the inner wall of the throttle will lead to insufficient air intake, difficult starting or easy flameout at idle speed. After the water temperature reaches the normal working temperature of the engine, the computer repeatedly adjusts the position of the throttle valve plate, causing the idle speed to rise and fall.