Ok, the dual sync probably rules out over heating magnets getting weak and causing a bad signal. I planned on using my Mallory distributor as a cam sensor and a homemade crank trigger to get the crank signal. The rare earth magnets I put into the damper were too small and when they got hot, I'd loose the signal. It took me a while to figure out what was happening - magnets get weaker as they get hotter who knew . I haven't yet replaced the magnets, so I'm just using the distributor for a crank signal.
I'm going to guess you've got a thermostat stuck open - either jammed with something or just failed. Is that the cause of the stumble ? IDK, but I'm guessing you will let us know !
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