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had the same problem with my E90 320d... sometimes powerfull and from time to time not powerfull....
SO I told this to my garage and guess what.... they told me they know the problem with the turbo. They have to change it now (in garantee of course). The problem is with a wire in the turbo wich is fault. As they told me, the computer of the car (engine) is giviing information to the turbo and in this case sometimes it is not understood well by the compressor.
So they will change it next week and the problem should be solved!
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