The accelerator of EFI liberation truck can't be added.

Your car has the same problem as mine. My car was repaired by changing the throttle (if the throttle position sensor can be changed separately, this will do). The reason is that after driving for a long time, the carbon brush of the throttle position sensor gradually surrounds the carbon powder of the dicing resistor, resulting in poor contact. After the computer board detects the data distortion, it starts the emergency mode and can only drive at idle speed.