Welcome to the club. Hope you get things sorted out on your X. When they are maintained they will run for a long time. I will hit 300,000 miles this week and to date I have had minor repairs and maintenance. The rough idle could be caused by a faulty air idle control unit. Pull it off and take a look.

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2010 X5M /// R63 AMG...Wifey's 540HP Family Hualer

2001 X5 3.0i Sport 335,448 miles & counting...
SMG M3 Steering wheel
E46 Stainless Racing Headers
4.6is Exhaust
Turner Pulleys
Afe Intake
Brembo drilled rotors
PowerFlex Bushings
Hualingan
30mm H&R Spacers rear
20mm H&R Spacers front
Bavarian Autosport High-Performance Coils
Active Autowerke's Performance Software