What is the reason why the throttle speed can't go up or down?

The failure of the fuel filler door to speed up may be caused by the following reasons: 1, oil pressure and oil pump problems: insufficient oil pressure, poor oil pump work, blocked oil filter or nozzle, resulting in untimely oil supply and unable to provide power to the vehicle well. 2. Clutch failure: acceleration or weakness may also be the failure of clutch parts such as refueling or wear; Cold car may be better, but with the increase of temperature, it is more likely to happen frequently or even "stop" the car. 3. Throttle and motor failure: Throttle stuck or motor failure. 4. Circuit failure: the spark plug and circuit of the live wire coil are open or short-circuited, resulting in insufficient power.