What year X5 do you have? If it is an 04 or newer it could be the intermediate levers, but that is not the most common cause of misfiring. It is a coil often as well, can be confirmed by swapping the coil from the misfiring cylinder to another and seeing if the misfire follows the coil. If that doesn't isolate it to a coil it may be worth paying for dealer diagnosis as there are ways to isolate if it is indeed the intermediate levers causing the problem with the BMW test equipment. (yet again, only if you have 04 and up)

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X5 pics

RIP 4.6is.....

2003 4.6is