What's happening in the wider BMW scene? Gossip and news about forthcoming models. Plus off-topic chat.
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I had similar symptoms on my 2.2i but the cause can only be the same as mine if yours has a fly-by-wire throttle. The throttle body was sticking which meant that the only engine speed possible was that allowed by the idle control valve. If I remember rightly I also had a couple of warning lights:- DSC and engine light. A used replacement throttle body cured mine. Good Luck!