525 tds 1997 e39 turbo and engine stall issues

Hello folks,
I own a 1997 e39 525 tds diesel.
Sometimes when i apply brakes or decelerate, when a reacelerate the engine for a moment stalls.
Other thing that happen me today was that i noticed that the turbo was not working due to slow car response.
is there any turbo not star working issues?
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