Here's a tip for the later Hall effect throttle pedal controls.
Hold the engine at about 2000/2500 rpm
And then have an assistant thump the floor area near the pedal with a rubber hammer. Don't go mad whacking stuff! alright!
In many cases if the hall effect sensors are bad, the thumping will disturb the already intermittently defective sensors in the pedal and the engine will instantly cut to idle.
Wiring problem or pedal problem is revealed.
Tuercas Viejas