AudiWorld Forums - 2008 Q7 4.2 Misfire problem

Hey guys, just replaced the valve cover gaskets on my 2008 Q7, and once everything was done and i started it up again the engine started to run very rough to the point where it would stall, but once i revved it past 1250 ish rpm, it would run perfectly smooth. Scanner said all the cylinders were misfiring, and it only runs rough when it idles.

Opened the hood back up and there was a very loud whistling/air noise coming from the left back corner of the engine (if your facing it) and its led me to believe its one of these rubber vaccum hoses, or something of the like. Any thoughts on what it is? Ways to fix it? How much it would cost to take to somebody? Sadly i cant find very much on the 4.2 in this model car. Thanks a bunch!