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I figured it out my o2s are isolated ground not case ground For what ever reason the pcm needed 4 low references pin c2 63 29 28 26 tied together or into a splice pack now and then I branched it off...

Here the run down on my project is a 03 4.3l ported polished heads, .516 lift cam 10.5:1 compression headers, marine intake, with 33lb injectors off of a 06 corevett so I used the corvette tune for...