From what I read a vacuum leak is one of the more common issue with BMWs. When the "service engine soon' light came on. The dealer wanted to do a "smoke test" at $150 to find the problem and SA said the cost will apply to any repairs. I had that issue according to the "service engine soon" report, but it went away and the dealer never did the test. The very infrequent idle surge went away and never returned.
Edit: Now the SES lamp came back on, but I have not felt any idle surge during stops, yet.
Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid. Albert Einstein
Swim upstream. Go the other way. Ignore the conventional wisdom. If everybody is doing it one way, there’s a good chance you can find your niche by going exactly in the opposite direction", Sam Walton.
Last edited by Dave 330i; 01-21-2013 at 12:40 PM.