That's what the blocker plate does.John, you say cease operation. Do you mean turn the egr circuit off with EFI. I know the blocker plate keeps the engine from recirculating exhaust gases, so how in the world is the gases still clogging the egr? Maybe I can come up with a way to block the crap before it gets to the egr.
Have you run the SES for the code? If you've had the truck blocked n fingered since 5k miles, the EGR assembly should still be clean and "operating" as intended.