We have the same year and I had all the issues that others complained about. I had to call BMW Corporate because the dealer couldn't replicate the issue. The stalling was what really concerned me as well as the surging when coming to a stop.
It's been a week since I picked it up and I haven't noticed any of that. The idle has been steady as well.
One thing that the dealer told me when I tried to get it fixed under the service bulletin was that my car didn't meet that SIB due to having a Bosch computer. Perhaps they need to load a slightly different update, who knows.
I don't think it's your exhaust vacuum line. I swapped in an axle back and actually broke the end of mine and it's just dangling there with no plug or anything. Zero issues.
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