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Thank you for explaining, many skilled people in this forum :-)
I found the turbo problem, there were 2 hoses that were not connected to the vacuum tank, amazing that the BMW workshop did not fix it when the car was there, I spent 10 minutes fixing it and it felt like the engine got 50 hp extra and it went a lot smoother. Could there be any reason why the previous owner has disconnected the hoses?
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