201? Audi S7? (possibly)

Not very official, looks to be the right size, shape, and it certainly looks very Audi

http://jalopnik.com/5616703/audi-s7-is-that-you

Yup its legit,

2012 Audi S7
http://www.leftlanenews.com/audi-s7.html

Im new to the forums. Im about to close a deal on a 95 S6 that my boss wants to get rid of. The problem is, that the car is running only on 4 cylinders. We have tried to change everything from coils to ignition modules.

Could it be the ECU? I cant think of anything else that would be wrong with it other than a ECU or possibly a cam sensor.

Im a BMW guy, and the only other Audi I have owned was a Coupe Quattro, and oddly that one had a misfire too.

Thanks for the help in advance.
-PJ