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Thanks so much, @ILENGINE ! That makes perfect sense. I’m guessing that’s somewhat involved to fix? I suppose I’ll just live with it if it is. It’s more annoying than really impactful (at least for now).

Howdy, I have a 12 year old Craftsman self propelled lawnmower with a 4.75HP Briggs and Stratton engine. It’s had this annoying issue for many years where it seems like the spark plug isn’t firing when it should, but only on some revolutions, never all the time (which would cause it not to run...