Well gee Steve, on the bright side, I guess no one can just get in and drive it off on ya'!
Now you have nothing out of the high tension lead but it fires fine occasionally?
By chance, you don't happen to have one of these attached?
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How well is that ECU grounded? Are the female side of the connector terminals tight on the ECU posts? I never came across one but I've heard of folks having a bad "new" harness.
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Grounding possibilities....
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