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I thought I knew it all..... I was having trouble with the ignition on a small 4 cyl engine.
I had a Digital Dwell meter attatched and it was Wandering, Hunting sort of..... so I got out the old Analog meter and behold....
The needle wanders back an forth alarmingly..
It's a bent Distributor shaft, or something wrong with the Vacuam advance hub within the distributor