I spent 2 days trying to diagnose a bad coil on my car once. It wold run like crap when it was warmed up, and eventually stall. The coil would test good by the time I got around to pulling it out and checking the primary and secondary resistances, and the output. Then when It was on the car it would overheat and fail. I chased that one down for 2 days, and I mean a full 2 days (40 hours) while I pulled the engine and re-degreed the cam and checked everything, rebuilt the carb, changed intakes, got a second electronic pickup(points distributor with petronix conversion), canged intake manifolds and carbs.
Ill never forget that one.
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