this is one good thread actually....I had a tach jumping problem, and starting/tuning problem. it would come and go. finally after many months, the battery died. I had been checking the charge rate and it was always over 12.9 volts. then finally after battery quit, it was not. I changed the alternator to a chrome one on Ebay on the cheap new.
presto. Tach does not jump, hotter spark, starts like a teenage girl from my childhood lol
and when I change the tune now, it stays there. this was driving me nuts.
the alternator had some sort of half aszed short in it.
whenever you have a problem you just can't track down, check the battery, alternator.
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