I think I found the cause of my EGR valve code. There is a large hose that goes from the brake booster to the top of the engine with a one-way check valve embedded inside. The air is supposed to flow freely, but it makes a "noise" when I blow through it and it seems restricted. The valve is working in the other direction, stopping back air flow as it should. I will try to clean it out later in the week, maybe tomorrow if I have time, before I buy I new one.