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I have a similar issue as well. 135i though. Cold starts when the revs get to about 800 after the initial start, it "chokes" and revs up to 1500 rpm. Only once it's warm it idles fine and such. No lack of power except if you try to drive off right away it, it almost stalls before the computer kicks in and revs it high to prevent stalling. I'm puzzled about this, as a leaky injector would cause performance issues all times and not just on cold starts alone.
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