It's not a clutch issue (if I understand what you've typed and it's that revs hang with a closed throttle, not that revs drop with constant throttle), so the places to look at throttle and fuel/air.
I don't know if this is diagnostically relevant, but if you blip the throttle a few times when the revs start to hang, does that help the problem at all or do they just continue to hang? Also, approximately what RPM does it hang at when you're experiencing the issue?
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DISCLAIMER: I generally have no idea what I'm talking about.
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