B4 1.9 TDI “Do not turn off”

Hello, I’m new here and have a question to the experts. I bought an Audi 80 B4 1.9 TDI with 147’km and now have the problem that the engine only turns up to 3200 rpm. The car has an automatic transmission. “Below” he makes my opinion quite normal – only he does not spin over 3200 rpm and does not go faster than 120 km/h. Turbo whistles can be heard. Up to a speed of 100 the power is naturally normal then I have extreme power loss and the r Motor sounds tangled up. Can someone please help me – does someone have a tip for me? Thanks! Rico