Hey Gio i got that too!... There is few diagnotics but since i have some leaks from valve cover gasket and can be corrolated with misfire (they say..) i will fix it at the garage...here is a link of discussion
http://www.xoutpost.com/bmw-sav-foru...-bronco-2.html

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2006 X5 4.4i premium, Sport package ,Winter Package, Sat Nav. AFE Power stage II Production : 08-2006
2012 BMW 128I Convertible Black
2011 Mercedes Benz B200 sold