[villagetinker]

I would be looking at the accelerator pedal, there is a sensor that controls speed. I would be looking very carefully at all of the wires and connections, and possibly the actual sensor, depending on the on the type used. As noted above you did not state the age, make, etc., so I am guessing a lot. A new sensor should be relatively cheap, and I would expect relatively easy to install. This where I would start.