My 2001 Allroad has lost it's get up and go. on 2001 Audi Allroad Quattro

My 2001 Allroad was running fine then it seemed like I had to push harder and harder on the gas pedal to get it to move. There is a growling in the engine when you push it. Car has no power and a growl in engine compartment. This is the twin turbo 2.7L. Please help

Asked by for the 2001 Audi Allroad Quattro
Try looking at, or better still testing ;-), the coils...