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i think a combination of cold weather, high ethanol and tune doing too much adjustment during idle mostly
your flexfuel device says e68 but compensation against ethanol is way off on your tune, or maf scaling and speed density are, or both
anyway you arein excess of 20% of fuel , during idle and closed loop ecu is pulling fuel -20% then on open loop just goes full bog rich
on idle both fuel trims and ignition timing trims amply oscillate, i think this + weather, high vacuum, high ethanol are the cause , tune would need a bit of adjustment
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