I have been chasing an abnormality in my Magnacharged '01 Vette for a while and could use some new ideas. The car runs very good in all modes except for part throttle with RPM between 2000 and 2200. When there, the right bank goes lean and the car stumbles. I have replaced the front O2 sensors, checked engine grounds and visually inspected wiring and ignition. An ideas would be appreciated. And if someone can tell me how to attach a scan and/or a tune to a post, I would be glad to do that.