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Hi Jack,
Well I've got no business advising on a car I don't even own, but I have some experience with the V/C ignition on the B23F cars that precede it. I think the controller is similar.
The knock sensor, being a high impedance crystal microphone, is read through a shielded wire within the harness, so it should be already shielded. If you only resheathed it, then the original coaxial wire should keep the ignition out of the knock sensor input. Sure, routing could further expose it to the ignition secondary, and depending on how close, maybe dramatically.
To test my wild theory, I would short out the knock sensor signal at the imfamous computer connector, keeping in mind some tidbit I read once where the processor is supposed to increase advance until it sees knock sensor output, then back off. Hard to say, though, when the trouble is intermittent.
The centrifugal advance on that distributor is not much under 2K and steady upward of that. But the vacuum portion combines what it sees in manifold pressure with what the controller knows about RPM to derive the much sharper advance curve. So, just thinking likelihood, I'd go with a bad controller, but if you already have a rebuilt, it makes me wonder why it was first replaced. That thing is pretty reliable and potted really well, unlike the connector and harness.
I'll check back next week for the update.
--
Art Benstein near Baltimore
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