[madmaxx]

I pulled the distributor and the bearing appears perfect, gear wear perfect (if there was any) spins freely, end play within range, magnetic pickup perfect resistance. Yet when installed and running it will hum like a bumble bee and is sporadic, sometimes it does sometimes it doesn't. My only guess is the arc between the rotor and cap. It appears the spark transfer from rotor to cap lugs is at the very bottom.

Who knows