ok PROBLEM SOLVED! 2xLS1 was on to something, yes I was open headers, so the O2's werent reading only exhaust but a mix of fresh air with it. Got full exhaust on and the narrowbands showed 14.7 and no more surging, tune is coming along good and wideband came in today Cant tune WOT really just yet, gotta let the Yank wear in. Oh, and no, stock injectors matty b