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My 04 545i is now running real rough. Started with just the odd what sounded like a miss fire when cold a couple a weeks ago and would soon come right and idle smoothly. Now it's constantly running rough, not 100% if it's a misfire, or running on 7 or what. I have tried cleaning the mass airflow sensor as one thing I might be able to do but made no difference. Any thoughts or suggestions greatly appreciated. I'm in Dunedin, if anyone here would be willing to help, yarn or suggest someone who may be able to help that would be great. I have just bought a K+DCAN cable to have a crack at trying to work out what might be wrong, but need to work out how to use that first too. Cheers Sam