Car idles and cruises flawlessly...I'm using the starting HP Tuners thread on here to do my tuning and that may or may not be where I'm going wrong? P.E. is disabled, but I'm not beating on the car. Scans aren't showing any knock, but once I get to around 2800 RPM I can just hear the blower building boost, then she falls all over herself. No vacuum leaks. No coolant leaks. No head gasket leaks. Full oil and coolant.

I'm thinking lean misfires? When the stumbling, hesitating, bucking happens my wideband does flash super lean each time...like off the charts lean...