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The flashing MIL indicates a misfire (as you have already explained). I'm not sure if the disconnected hose could have caused that, though. Maybe someone else will be able to answer that.
A non-flashing MIL usually indicates an issue with the gas cap. Since it was replaced, it's possible you are not tightening it enough after your fuel fill-ups. Most of us have learned to make sure there are at least 5-7 clicks of the cap before stopping. The MIL will normally turn off by itself after so many miles of driving.
bruno
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