Any possible alignment issues where the cable may be pulling at the throttle shaft at an angle?
Perhaps pull the cable off the carb linkage and attached a return spring to the cable end and exersize it to see if the problem remains with the cable or foot pedal assembly.
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1968 Firebird
IAIIa 522
340 E-heads
Northwind with XFlow TBI
4L80E
3.50:1 Rear
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