OK, so I went through the tests I found here:
http://easyautodiagnostics.com/gm/4....-valve-tests-6
I translated them into my own doc to make them VX specific:
https://docs.google.com/document/d/1...CvhzSrsJzmSeQ/
I have every indication that my current and previous EGR valves are OK based on the tests recommended.
In the process of replacing the Vapor Canister Purge Solenoid (2N1001) (referenced elsewhere here as the Vacuum Control Solenoid)... I noticed one of the hoses was cracked, and perhaps leaking... I think I've fixed this with a zip tie (it was too hard to get to in order to put a metal hose clamp on it).
Also, when my new EGR valve came, I noticed that the ACDelco gasket felt like it was cardboard sandwiched outside of a metal center... my old gasket was just a piece of aluminum. Perhaps there was a leak? I've put the new part in (though I now have 2 old EGR valves which test OK)... I'm clearing the code and seeing what happens. Wish me luck!
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