Well the inevitable happened and my RS6 left me stranded on the way home from Christmas as the parents. I was on the freeway about to do a pass and when I pressed the gas the car hesitated and almost died. At first I thought the torque converter gave out since I could hardly get any power down but when I went to start it to get it on the tow truck the car barely started.

I towed it to my sister's and when I checked the codes, as crazy as it sounds, there are no faults for the engine or the transmission. It takes a lot to get it started and you have to press the gas to keep it going. Smells really rich. My guess is the fuel pressure regulator but it is really a guess.

Any thoughts from the experts here?