sounds like the harness. i had a similar problem all because of a small harness short that we couldn't find visually, had to go through and check the whole thing with a meter, found some strange voltage fluctuation, replaced the stock harness with a brand new stock harness and it ran like a dream. mine was running super rich, backfiring, surging, and stalling out like crazy. some times it would be fine, sometimes not, thats the beauty of electrical problems. might as well replace the harness after all the other money youve thrown at it, wouldn't hurt.
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