I saw that over on the MB forum. I think those cars all had over 100k miles on them and yes that line was caked with carbon. My car only has 14k on it and when I installed my cold air I cleaned that area and nothing, it was pretty darn clean. Now that line may be clogged but I guess they will eliminate that with the valve. If it still pulls the code then that's really all that's left. Thanks for your thoughts, I'll post the final result. the guy who runs the shop is a friend of mine so I'm sure he will take care of me, my wait this morning was like 15 minutes. he's the service mgr. and he personally wheeled out their computer and hooked it up to the car in the lane so I didn't have to wait. Funny thing is the car really feels like it is running strong??? No rough idle or anything.