Hey y'all, having the same issue. It got really bad about a week ago and I went and put the best fuel I could find in it and it ran much better. I'm hearing a rattling noise on the drivers side bank that accompanies the rough idle. I did put it on INPA and noticed that the cam position on the intake is pegged all the way to one side. I'm thinking that might explain the rattling that disappears when the idle clears up. I think I've got a dirty vanos solenoid. When I first bought this X5 it was having issues with misfires and it ran really bad. I popped the vanos solenoids out, cleaned them with some solvent, applied voltage to make sure they operated properly, installed fresh seals and it fired right up and ran like a factory fresh motor... For over a year now, then this issue started up recently. I'm going to pull the solenoids and clean them and see if that does the trick.

Let me know if any of you have any new updates to your situations.

Thanks