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2002 rodeo, insufficient flow

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.