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If it were a Chevy I would say the starter needs to be shimmed to adjust the clearance between the starter nose gear and the flywheel. On a Chevy loosening the starter mounting bolts a bit sometimes would clear it up by reducing the wham factor.
But on a 944 I have never heard of this issue. It makes me think the solenoid or starter engagement mechanism is hanging up as 944 Ecology alluded to. You could remove/take the starter apart and look for hangups, lube, etc. First I would loosen the starter bolts slightly and hope for the best...
Incidentally my 85.5 944 is occasionally doing the same thing with a recent rebuilt autozone starter...
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