Getting Codes P0507 and P0171. With varying throttle in neutral. Please Help

[Goodiejay]

The car runs fine when driving but at lights and intersections my TAC is reading anywhere from 650-2500 RPM's. Was thinking possible MAFS or TPS. but dont wanna dump a bunch of money into a part if its not gonna fix it. And i definitely dont wanna take it to a dealer.........PLEASE HELP

[QuattroCan]

PCV VALVE

http://www.audizine.com/forum/showthread.php?t=419085

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[Goodiejay]

Thanks. I had it narrowed down to a couple things. and everything kept leading me back to the PCV Vale.

[Miguel4u2]

Im having the same issue. been reading for weeks to no avail. Got Audi Manhattan to replace fix Pcv and other tsbs under warranty and still getting those same codes. When i throw the car in third on the high way and give it gas i get a cloud of smoke out the exhaust at about 4-5k rpms. Leaking or cracked valve cover is what im leaning towards now. My rpms idle from 8-1500. Usually idles somewhere in between and car hesitates to bring rpms down after giving it gas it neutral