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The mystery is solved. A google search turned up several references to 1 cylinder missing at idle, most suggesting vacuum leak.
I took the air cleaner off, and there was one more vacuum connection coming of the rail than there were hoses to attach. I faintly remember a cap on one of the connections, and my service manual showed what looked like a capped line.
Capped that line and reassembled and all is well. The capped line (#6) is right next to the #8 vacuum line going to the air control diaphragm which I disconnected , but I swear I didn't touch the cap. And it ran fine for a couple of days, so I don't know how or why the cap would have fallen off.
I wouldn't have expected a vacuum leak to cause a single cylinder to not fire unless it was near that cylinders intake.
Thanks for the suggestions.
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