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Thanks I'll Give that a shot.

Yeah I don't think its o2 issue because my wb pegs rich,and the ecm starts to trim -25 but it stays pegged rich. if the o2 was falsely reading rich and the ecm trimmed that much then I would think my...

yeah i noticed that , but it its like the ECM decided to dived by zero or something... starting to wonder if the e85 has nothing to do with it, and there might be something wonky with the ecm. Maybe...

Here's the deal, making the switch to e85 (E68ish for now 3gal 93/e10 10 gal of e85) , car runs fine , did some pulls then will randomly goes pig rich, it didn't do this on gas and the only thing...