Sorry but I cannot eccept the answer since non of your suggestions have fixed the problem. I spent hours and pulled my hair out ... Here is what fixed this vehicle.
When I was flushing the fuel rail and found water in the fuel, that was an eyeopener.
Since I found water in it I had to drain the tank to make sure there is no more water going to come to this fuel rail from the tank, to call this a fix. Here is the explanation as far as why cyl 3 and 6 injectors were shut off. The important thing to note is that the fuel rail on this V6 engine is about 1.5" lower towards the firewall then the front of it, on both sides/banks. So where does the water go to? The low point. So Cyl 3 and 6 were getting the water and missfiring and the injector got shut off with the selective shut off so there is NO damage caused to the cat. In this case I do not think that the water would damage anything, it would be steam by the time it hits the hot exhaust manifold and cat. After draining the tank and flushing the fuel rail I had 1 qt of water out of the system. Now it runs once again the way it should and no more codes.
So do I now get paid to educate you?