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cold start issue.

  1. E46 325 rough idle and increased fuel consumtion?

    E46 Convertible
    Hi, so recently on cold mornings upon engine start after a minute or so, the rpm will start bouncing up and down a little bit and then the whole car shakes/ rumbles. At this point if I leave it, the engine management light will turn on and the error comes up as cylinder 4 misfire. Then after...