Sounds like the bearings were on their way out. I've had one distributor personally do that on my hondas.
I bought an accord once that had a snapped timing belt due to the distributer siezing and cracking the entire distributor. Car was great for me, though I'm amazed it survived the ordeal.
Glad to hear your issue is resolved.
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On the never-ending quest for better gas mileage...
I've read about bad bearings producing enough heat from friction to melt the rotor. I bought a D16A6 several years ago with a seized distributor bearing. I got it at core price because the salvage yard thought the whole motor was seized. I bought a replacement distributor, but actually managed to drill out the screws in the distributor housing and replace that bearing, giving me a spare.
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