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I wanted to update I resolved my issues with the CEL P0301.
The closed loop/open loop transition in my car while running E85 was EXTREMELY rich, (AFR went down to 9) and this caused a misfire condition.
I asked my tuner to lean out the transition and now it only goes down to about 10.2, no more CEL.
This happened a few months ago but randomly saw this thread and wanted to let everyone know that may be your cause.
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