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My idle fuel trims with OFT e85 tune are around 9-11 percent. The engine definitely needs the extra fuel to idle. If I flash a new tune, it’ll want to stall at idle until the fuel trims rise to compensate. My guess is it’s due to high ethanol content in the local e85 supply.
My open loop AFR’s look spot on around +5 percent ltft. I’m guessing if I had a full catless header/exhaust setup, I’d need right around 9-11 percent ltft (which would match idle).
Are you using oem header and exhaust?
Also my engine has never stalled out or thrown a p0301 misfire code, so I think that m get be due to something else (like your coilpack or spark plug).
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