From what I can tell it seems like you might have a vacuum leak. Have you tried doing a leak test? I think the reason you're getting all the inefficiency codes is because the engine is sensing extra air that it hasn't found when going through the MAF. Check out this link http://www.audizine.com/forum/showth...st-Leak-Tester Also if you have access to a smoke machine it will also help in visually showing you where the leaks are. When I first bought my car I had a HUGE leak in the PCV lines under the intake manifold, 3 mins of letting the smoke machine run and saw it pouring out from under the intake.