Dumb question, but are you sure the actual throttle lever on the IP is moving when the pedal is pressed? There is a complex path from pedal to cable to multistage bellcrank to IP.
If throttle lever is moving, the next thing to suspect is the governor linkage inside the IP is stuck. It can be disasssembled on-car for inspection.
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Thanks,
Jim C.
1985 745 TD MT (project)
1986 A2 Golf GTDI swap LeMons racer (very not stock)
2001 Golf TDI (not stock)
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