Very unlikely this has anything to do with the EGR system or the thermovalve.
More likely a carb that needs cleaning.
You defnately should plug the large line off the EGR that runs over to the AAV on the passenger side fenderwell. It causes a big vac leak. But otherwise the EGR vavle itself is not likely to be any sort of issue.
Yep, that's exactly what it turned out to be a vacuum leak. Ended up plugging where the intake went to the thermal vacuum valve, which seems to disable the anything going to the EGR, and she runs like a dream again.
Incidentally, also thought it was the car and cleaned her out pretty good.
Here's a picture of what I ended up doing (pic of passengers side of the engine):
Edited by belacane, 05 January 2014 - 06:23 PM.