Buick Excelle doesn't catch fire, and the accelerator pedal is extremely small.

It may be mainly caused by excessive carbon deposition in throttle, idle motor, air intake, air intake valve and combustion chamber. Because there is too much carbon and dirt in the air inlet and the cross-sectional area of the air passage changes, the control unit can't accurately control the idle intake air volume, which leads to the mixture being too rich or too thin, which makes the combustion abnormal or the engine shake or even fail to start after starting. Or there is a slight leakage from the fuel nozzle, which causes the fuel to leak into the combustion chamber for a period of time after the vehicle is turned off, which leads to the excessive mixture when restarting, and finally leads to the difficulty in starting.