Lincoln still can't figure it out. Brought it to a private mechanic who determined that there is a defect in the valve cover and valve cover seal which allows oil to pass into the cylinder (this time #5) and drowning the plug.

Just changed the ignition pack and spark plug on #5; changed the temperature sensor for the heads since it was defective. Not over heating now however still stuttering and acting up as if no service was done to it.

Will let the computer relearn the codes and then I'm going back for a review of the codes again. And reevaluate what's going on now.