Accelerator
Your problem is worn brushes/tracks within the box at the spindle end of the throttle arm. There are 4 sets of three tangs which scroll across their respective concentric curved contact tracks from which the signal is generated to give a variable throttle signal, from idling to full throttle.
I have two photos of the brushes and the tracks in Photobucket, but am unable to upload them on to show them here.
I had your trouble and ended up having to buy a complete throttle and brake pedal unit from an X-Part agency near where I live. It cost me over £100. MarinaBrian said at the time that I could have bought the pedal alone, but I was unable to, even after arguing at the agency that I did not need the brake pedal, only the throttle.
Your best bet is to go to your local scrap yard and get a throttle arm. It may be worn but, should still be usable and not completely worn out as mine was
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