After the car started, it shivered and shook badly, and it turned off.

1. Add high-quality engine oil. If inferior oil is used, gum and carbon deposit will be produced on the valve quickly. 2. Run at high speed for a while immediately after cleaning to avoid scalding the cleaned materials. 3. Try to avoid short-distance driving. If the distance is too short, the car will stop before it is hot, and it is easy to form carbon deposits again. 4. Keep running at a high speed, so that the throttle is not easy to form carbon deposits and will not get dirty quickly. 5. Adding a cleaning agent to the fuel tank and burning it with gasoline can also clean up the carbon deposit. 6. If there is too much carbon deposit and special repair methods are needed to clean it up, it is necessary to come to the service station for maintenance. There are several reasons that cause the car to shake and vibrate after starting: 1. Carbon deposition generally appears in the existing throttle wall, intake valve head, intake port inner wall, piston top and combustion chamber inner wall; 2. 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. After the water temperature reaches the normal working temperature of the engine, the throttle opening exceeds the normal idle speed value, causing the idle speed to rise and fall, and the computer repeatedly adjusts the position of the throttle valve plate; 3. I think the place where carbon deposition is most likely to occur is not only the throttle, but also the intake valve head (the end of the intake port). The gasoline injection of indirect injection engine is injected into the intake space where the intake valve head is located, and gum, wax and unburned carbon compounds are basically deposited in this place. The surface of carbon deposit is quite loose and spongy. After parking overnight or for a long time, most of the fuel injected by the injector began to be absorbed by carbon deposits; 4. The amount of fuel entering the cylinder is insufficient, so it is difficult to ignite the lean mixture. With the rotation of the motor, the fuel injected into the cylinder is enough to ignite. In this case, it will definitely be difficult to start. What's more, if carbon deposits accumulate too much in the head of the intake valve, it will affect the tightness of the valve seal and make the cold start more difficult. Even if it can be barely started, it may be closed soon. And with the increase of engine temperature, the absorbed fuel evaporates and is sucked into the cylinder to participate in combustion. This part of the fuel is not controlled, which affects the concentration of mixed gas and may also lead to poor engine work.