Slower car high idle

[grim]

Hi all.

2007 a6 c6 3lt allroad.

Any advice as I'm all out of options. It's hard to describe the car idles higher than usual and there is a distinct slow pick up and less torque. Turbo don't kick in till 3rpm as wen before it would be 2 and a hell of alot more powerful. Over taking at speed is a real problem. If you had never driven the car you probably wouldnt notice. So i had a p200 fault code. So i changed the throttle body and cleaned the turbo New air filter fuel filter. There is no longer any fault code but the car is still the same. any advice on possible cause would be much appreciated.