Well, the shop looked it over and only the intake manifold gaskets are failing. It has 79,500 miles on it. Right on time!!! One more for the General Motors class action lawsuit when it develops!!! (NOT holding my breath on that one....)
The P0304 is being caused by a bad injector so it's getting replaced at the same time. Getting rid of the Dexcool crud and she should pur like a kitten again. Maybe the MPGs will go up a bit with a new injector in #4 and new EGR valve!!!! Gotta hope for something looking at $2.34/gal and going up every other or every third day!!!