Hey I know my 94-97 Mn12's like the back of my hand. Just like you know 89-95 SC's.
Too bad Darrin erased the 95 4.6L EEC before sending it back to me. Gotta talk to him more about that.
I bet we just saved you a set of cats and endless O2 sensor replacement attempts.
The problem is that when the EEC went the car dumped gas out the exhaust. Carboned up the plugs, O2's and heated the cats. Hopefully the latter is fine. You will find out during inspection.
Still, If you have the time I would get a little propane on those front two o2's. See Jakes write up in the tech section. I bet they have some carbon since the plugs had it. It will save on gas and prevent the infamous lean error code.