Thanks kpaske.
Also, NAPA sells a replacement gasket with a screen in place for the valve hole (large hole), about $10.00. This helps with breaking up the carbon as it passes through. Helping to keep the carbon from building up in the egr.
I had this problem with my S-10 SS. It caused the engine to stall at idle and under load on the highway. Got so bad the truck wouldn't run. Took off the egr and cleaned it real good/replaced the gasket with the NAPA one and it has run just fine since.