Recently after fueling my wife 99 A6 Q 2.8 with prem. of course, the car doesnt want to start, actually have to press the gas to get it to start, happens only when filling it full, any help on why this happens would be great????

Well I would guess it is a vaccume type issue, its chokeing actually, thats what it sounds like.

If its still full try leaveing the gas cap cracked a little or open it up as you try and start it and see if that helps any. No engine lights on.