Solved!
Finally other people had the P2074 code issues. It seemed to affect my car differently but basically any time I had a 2005 tune the car could and would throw the P2074 code while part throttle boosting. Something about this made my car show a miss on cylinder #1 under WOT which would set the CEL flashing and severely limit power. I also had the issue with the car cutting power and dumping fuel at the end of a pull through third and upon shifting to 4th would still have reduced power with A/Fs at 10.0 or lower.
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