I am getting an Insufficient Flow error on my Rodeo. OBD code P0401 says it is the EGR valve, which I replaced and then cleared the code. However, the error comes back. I also cleaned out all the buildup I could see where the egr valve connects to the the engine as well as blew everything out that I could with my air hose.
So here is the question: What is the next thing I need to look at to resolve this issue.