[JhwShark]

Buckeye,
I've read through this posting and understand the frustration. Big sorry for you and your girl. Also, BIG THANKS for your service in or with the Army!

I am no Buckeye fan, live with a Block'M" wife...yet, that does not stop my desire to help.

It seems you have replaced all incidental items, tune up as well as fuel system plus ECU. So I'm just going to list, some may be redundant , irrelevant, or completed. It is odd that your last time on return trip it was fine??? What has been the outside temperatures?

How many miles on the engine and has any major work been done...just to get a baseline on current state of the rig??
Have you gotten to a compression test (wet and dry)?
Can you do a CO at the tail pipe and/or is the tail pipe sooty?
How is the state of fluids, oil need additions frequently? and the H2O? when you do an oil change do you smell much gas odor in the oil?
When you had the plugs replaced, what were the individual observations, consistent or varied? Pull the new ones and compare to memory.
When did the last valve adjustment occur and was the head torqued (over-torqued?) Could you have an issue at the head-gasket?
Do you have the Blue coil? Is there a Balsat resistor in line with it or any coil, has it been checked?
What has been done on the distributer? if vacuum advance is the diaphragm good?
Has the car overheated in a major way?
That is all I can think of right now.
Jon