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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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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