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I can't believe 45 posts later and you haven't done a fuel pressure test, and checked exaust for back pressure ! Screw a gauge into front o2 sensors and see reading. The reason it ran better with a tune is they fattened up the mixture and advanced the timing curve. I still can't believe you bought it this way, without having them fix it first. What if your motor had been shot, bad valve, rings. Do the 2 things I mentioned and quit screwing around with ******** data. You got to get old school and get the basics right. I'm getting worn out reading that many posts!
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What was I thinking. It will not rev past 3k in neutral, it has a rev limiter.