Why can't the cold car start, turn off, shudder and refuel?

The cold car began to stall, shaking and vibrating, and the reasons why it was impossible to refuel were as follows: 1. Reason one: the spark plug loses its ignition ability. 2. Reason 2: There is something wrong with the throttle. 3. Reason 3: Carbon deposition will cause insufficient combustion of gasoline, leading to engine vibration. Carbon deposition in Q _ engine has a great influence on vehicles. The first task is to reduce the engine power, that is, to make the power output uneven and gradually attenuate. In other words, it is becoming less and less powerful. Second, increase fuel consumption and economic load. 4. Reason 4: It is difficult to strike a fire and it is not easy to get a taxi. Finally, serious carbon deposition in the combustion chamber will also lead to cylinder explosion, low-speed acceleration, noise and piston and crankshaft damage, which will seriously affect vehicle safety.