Cool. I examined the upper a bit yesterday when I got home and doesn't look too terribly bad to remove. I'll drop by Ford today or tomorrow to get the parts but I may not be able to get to it until next weekend. I was worried about the lower but I haven't lost any coolant. The radiator was full last night when I checked it.

After resetting the CEL Tuesday night, it hasn't come back on. I drove to and from work and to lunch yesterday and then to work this morning. I know it will be back.
While I am working on the truck, I plan to replace the 02 sensors and the thermostat for good measure.

Thanks again for the tips.
Casey

 

I guess I should update this thread if anyone is interested.

The plenum gaskets and the O2 sensors were replaced at the same time and the problem went away.

No more CEL!

Thanks for all of the advice.
Casey

 

Thanks for closing out this thread Casey.

Your right, it could be of real world help to someone troubleshooting their ride, with similiar problems.

Good to hear all is put right!!!!