Will the head speed of Chevrolet Le Chi 1.0 not drop? Always 1200 rpm

It is suggested that the throttle line should be detached from the throttle first, and the throttle opening should be controlled directly by hand to see if there is any improvement. First, check whether the pedal and accelerator cable are stuck. Ordinary gasoline vehicle-accelerator pedal-accelerator line-accelerator ordinary diesel vehicle-pedal-accelerator line-accelerator control of high-pressure oil pump motor-pedal-slip resistance-voltage signal.