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When this started to happen my first thought was CDI box ( 6 Pin Bosch ) but I was under the impression they would work if good and not work if bad.
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Can't say for sure with the Bosch - mine had PermaDoom. I drove it from the house, it was fine. Went to leave a couple of hours later and no start. Swapped fuel pump relay and the car started. Got almost home and it died driving. It started a couple more times once I got it home but wouldn't stay running for long.
Edit: A couple of weeks before the PermaTune joined the choir invisible I was chasing a problem that seemed to be a result of installing a wideband O2 sensor with a narrowband output fed into the ECU. I had a loss of power similar to what you described but no bouncing tach needle. I ditched the aftermarket O2 and installed a regular Bosch. Adjusted the mixture after that (with help from Jim, Bob, JR and others) and thought all was well. A week later, dead CDI. I'm not saying it's the same thing for sure but I find it suspicious that we had 2 similar symptoms (radio quit and intermittent loss of power). Maybe you and I should at least go buy lottery tickets.
The VR idea is interesting. Could a faulty VR affect or damage the CDI or cause premature failure? Might be something to ponder further.