A Buick Excelle automatic car with a mileage of about 41000km. Owners reflect: recently there is often inexplicable flameout in driving. Owners are very worried that they are afraid of accidents when they are driving at high speed. After receiving the car, it is found that the change of the throttle will not cause the flameout when the vehicle is not driving, but it is found that the phenomenon of flameout occurs when the vehicle is on the slope, abrupt acceleration or sudden deceleration, which is not common in the automatic car. At the same time, it is found that if idle air conditioning (refrigeration) is opened, it will appear idle or unstable. The vehicle often runs unstable or even fails when it has a load.