2003 audi a6 2.7 biturbo...looking to buy this car but the car has a issue...the guy says it idles rough and the car does not want to shift when going...check engine codes are p0305 p0304 p0304 p0300 p0171 p0175 p0174 p0172 p0103...I herd the car run and it does have a rough idle but starts up nice...car had 160k...I know this is a long shot but I don't know much about these cars...thanks for your help...nate

 

Sorry man, but you should run away from this one. It's bad enough when they are code free and running correctly, they can still be expensive. But this sounds like a disaster unless you are very mechanical and a DIYer, with deep pockets.