StanF18 - I agree with the cold weather start issue...seems to be the only time I get the misfire/rough idle issue. I researched the SIB that was referred to on this forum (God bless who ever posted it!!) and my X seems to fit the parameters with a build date of 10/04. I emailed my SA (closed today) and asked him to refer to it. Who knows. I hate to say it, but my X is quickly becoming the "special car" instead of the daily driver. Might be better in the long run......