I doubt, its related to previous repairs, probably related to age and temps if anything. Since you turned off the speed control with the switch and confirmed with the indicator lamp going off I would assume the problem is mechanical. I would be looking at the throttle body and linkage, cables and speed control servo for problems. Seems more like a cable, linkage or servo is binding causing the throttle plate to stick open.
Also dont forget to check the floor area around the throttle pedal, I dont know how many times I have found floor mats jamming the throttle pedal.
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