Starting a car means that the engine is shaking badly, and sometimes it will turn off without refueling. What's going on here?

Possible causes and countermeasures of serious engine jitter and flameout tendency: 1, the throttle is too dirty. Excessive carbon deposition in the throttle valve directly leads to unstable idle speed and poor acceleration of the engine. Clean the throttle. 2. Too much carbon deposition in the engine will reduce the volume of the combustion chamber, and the endothermic characteristics of carbon deposition will also lead to non-growth combustion in the combustion chamber, increase the knock probability and make the engine shake. Clean the carbon deposit inside the engine. 3. The engine stalled. Poor ignition of spark plug or poor atomization of nozzle, incomplete combustion of cylinder or no combustion at all are serious jitter. 4. The fuel is not good. The poor oil quality directly affects the combustion efficiency, and the low octane number is the main reason for engine knocking. It is recommended to change to a better fuel. 5. After the hot car is started, the car does not start directly, and the oil lubrication between engine parts is not in place.