This sounds a lot like the problems I'm having (see post "Complete loss of power.."). Only difference is that you have a trouble code for the EGR. It sure sounds like the EGR valve could be sticking open. The EVP is easy to test with a VOM, and you can test the EGR with a vac pump.
I can relate to your frustration. If you find out what's causing it, please post it.
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