Hi Heather,
Mine plugged up at the head end of the steel tube that goes from the EGR valve to the head. I didn't remove the EGR valve, just the tube. It's two 10mm bolts on each end to remove the tube.
The problem is that the port in the head was also packed with carbon, so just clearing the tube won't help. You have to clear out the passage in the head too. I just used a piece of copper wire because it was the tool available at the time. A little Gumout carb cleaner helped too.