Egr valve
Welcome to the 6.0 forum and to FTE. Please take a moment to check out the Welcome sticky post at the top of the forum page as well as the other stickies there. Lots of links to great threads and other information. The search feature works great too

And for your viewing pleasure, check out the link to the Posting and You public service announcement:
http://www.albinoblacksheep.com/flash/posting.php
Go to the tech folder in the sticky section at the begining of the 6.0 forum. There you can read up on many things...specifically the cancerous wart of an EGR Valve.
Mine accidently became unplugged over 10,000 miles ago.
There is a lot to read so get the beverage of your choice, grab a couple of hours, and read on.
Then feel free to come back with any questions and we will be happy to enlighten you.
Again, Welcome to FTE and have a good read.
I too drive between 5 and 7 miles back and forth to work in very cold temps. I was told that this cold affect the EGR valve since it never really gets up to full temp. When they pulled the first one out it was covered with black soot and allot of carbon.
I have had mine replaced twice and then they told me to try running a fuel additive like Staynadyne or any other type that increase's the cetane level in the fuel. I run additve now on every other tank of fuel and have not had any more problems.
good luck



