Broken roll pin in distributor also happened to me. Well known problem often also with a totally sheared roll pin leading to severely altered timing and non-running condition. I could rotate the rotor by hand in a non normal way, which you should be able to check rapidly without pulling your webers or the distributor, when the distributor cap is off. I then got a rebuilt, recalibrated Duraspark distributor with small cap from DUI Performance Distributors, and it has worked like a charm for about 7 years now. Cheers, Tim
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