I had a post with some detailed pics on this before, but I have taken the pics off my web space provided by my ISP.

The EGR valve is on the top, back part of the engine, on the passenger side. It has a tube running down from under it. The EGR fitting, which tightly holds the tube to the valve, is the culprit. It has been known (by many VX'ers) to come loose and slide a small bit down. It WILL sound like a diesel!!! You need to slide the fitting back up, and screw it back into the bottom of the EGR valve (well, it's actually the mount that the valve is mounted to).

I wishe I had pics... it is pretty easy to find. Now that I have my SC installed, the pics I coudl take would be different than what you would see.