Here is a guide I found on the internet which explains the process of cleaning and repairing a faulty EGR valve. I used this method on my Stilo 1.9 Mjet and i worked a treat. The guide is attached to this post as a pdf
Sorry, if you go "back" one page to the guides index, you'll see a paperclip just to the right of my guide heading. Click on that and you should get the pdf. It's also in a link below: