I have finally officially solved my recurring EGR issues!!!!!!! I cleaned out the EGR intake tube, replaced the EGR, replaced vacuum lines, and ran sea foam through the intake and gas tank. The code cleared for a week (long enough to pass smog) and came right back. I bought another new EGR but when I went to replace it, I realized that the threads where the EGR mounts to the intake had become stripped out and the bolts would not fasten tightly enough. I drilled and tapped them and had to bore out the EGR mounting flanges and EGR gasket a bit to accommodate the new, larger bolts. I am happy to say that the CEL has been out for 2 whole weeks! Hoping it never comes back..