Hi Guys
Please need help
My 2005 E200 Kompressor has this problem..Please not no codes or fault light

Putting down pedal slightly a burr sound like exhaust
Lifting slightly same sound
No power
Gearbox not changing sometime but most of the time manually
When idle and revving up sound all good

Could this be a vacuum problem or Supercharger hose?
Thanks Theo from South Africa