rough idle

I have 2006 525i about 6 months ago it started idling rough. I put some fuel system cleaner in and it got a little better. Had it to the dealer and they do what they do - put it on the diagnostic equipment and found nothing

I had a problem with my previous BMW and finally they sent out the factory rep? and he found that is was a tensioner pulley. I am wondering if they still have these people and how i go about contacting them

thanks
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