'06 X5 3.0. I've done some research on the board here to see if anyone else has experienced this but not seeing identical symptoms in the threads I've read. For the last few days, idle is rough after 1st start of the day and only occasionally when coming to a stop during normal driving. Driving at speed is still normal and smooth without a stumble so far. Feels like a bad coil when it does stumble on idle, but again this has been intermittent. I'm assuming if a coil was going bad it would do it at all rpm's, but I could be wrong. Not getting a check engine light, either. Under WOT still pulls strong. Any thoughts on what might be starting to die?