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Been having the same problem as well as partial throttle hesitation. Of course, dealer "couldn't find anything wrong".
I offered to go on the test drive and they asked me why I would need to... because I have to point out the obvious since they don't drive the 335 often.
My partial throttle problem is most noticeable in the 2k-3k rpm range. It's not a turbo lag even though a tech tried telling me that. The car just falls flat on it's face then a couple seconds later it surges.
At WOT I've had the car just not respond at all and then a few seconds later it takes off.
Maybe it's too much electronic 'thinking' in the throttle input... who knows.
But it's a recent problem and after a few software updates, fuel pump replacement and injector replacement.
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