i had the same problem a while back. car dies sometimes but not always. sometimes i could keep it alive by pressing the pedal to the meta. but ur issue seems very similar to what i as going through. ca runs perfect al high rpms (3000 and above) but its at a risk of dying if the rpms.drop below 2000. i went thru hell before it finally threw a code. turned out to be a faulty MAF. replaced that and everything was fine. keep in mind though, i have the 740i v8 version i.e. the n62 so ir problem might be different. but the symptoms u described are VERY close to mine.
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Last edited by mokh; 11-14-2012 at 03:02 PM.