Just to give a final update - after tending to some maintenance (2 rear wheel bearings, axle boot covers and repacked cv joints, brake and clutch bleed, air filter), I was able to take the car out for the first time today since the original posting.
No more signs of trouble. Took it up to 6500 rpm, sounds and drives beautiful. It appears that indeed the culprit was a loose spark plug. Whew...
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