My X5 has the Cold Start misfire and runs rough. P0300 code, but if I clear the MIL illumination the X5 immediately runs better. I know you must be thinking it's coincidental, but It's happened more than once. Temps have been in the low teens, she runs great in warm weather and after warmed up.

BMW wouldn't do the intermediate levers, they say could be ethanol, I try powering on the electric before I start it, and I use Techtron.

What could be the solution?

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