The car didn't catch fire this morning The mechanic said it was the ignition coil, so I changed it. Then I said that the throttle was broken, so I changed it. It was still the same problem.

It may be mainly caused by excessive carbon deposition in idle motor, air intake, air intake valve and combustion chamber. Due to too much carbon and dirt deposited in the air inlet, the cross-sectional area of the air passage changes, resulting in too rich or too thin mixture, which makes the combustion abnormal or the engine shake or even fail to start after starting. Or because there is something wrong with the injector, it leaks or accumulates too much carbon, which leads to too thin mixture at start-up and makes it difficult to start. There is also a failure of the carbon canister or the solenoid valve of the carbon canister, which will also lead to difficulties in starting.