Hello
I would say idle speed control valve needs cleaning or replacing. It won't register a fault code.
Gearbox whine could be low fluid. There is a level plug on the passenger side of the gearbox located next to the ns driveshaft inner cv.
There is a drain plug and a filler/level plug.
Hope this helps
George
If yours is a mk2 then gearbox whine seems to be more noticeable.
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