Hi I have an audi TT 225 2003 1.8 turbo. The other day the car seemed to stop pulling as well as it used to I have removed the air filter and put my hand over the air inlet and the car cuts out hence the reason I think there is not a leaking pipe. I have changed brake vacuum hose and n75 valve but it still does the same. The turbo is spinning up ok but it soulds like the engine is not requesting the air when you throttle up. It has been into my local garage who cannot find any fault I also have plugged it into VAG COM and there is no faults coming back on the computer. Any thoughts I am getting desperate?