Idk if you read this from the beginning but I had had some hesitation at highway speeds. So OT plugged it in and showed something with the left O2 sensor. He checked it, it was wired up wrong because it was a universal O2 sensor with no plug. Since it was all screwed up it would retard timing and some other things which werent good. Anyway I think that could have been the culprit or the whole thing.
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