I recently had a similar thing happen, but it was hanging on throttle close. Verified at the TBI, no issue, but at the pedal there was a bind. Turned out to be the factory cable was fraying inside it's sheath near the peddle assembly.
If it's the original cable, it would be worth removing and inspecting the movement of the cable within the sheathing to verify that's not the cause.
I replaced with a Lokar cut to fit cable which is very nice.
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-Jason
1969 Pontiac Firebird
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