Right.
I have noticed with my 89 gti that when I’m in 2nd particularly, 3rd gear and try to floor it, the revs do go up but occasionally the power from the engine does not transmit through to the wheels causing hi revs but no acceleration. like it disengages momentarily.
Could this be the clutch on its way out?
Also I have noticed that my accelerator pedal is very very stiff as is the clutch pedal.