Greg, I think I found my gremlin..=D>
and I can't believe what it turned out to be. I was wiggling everything while the engine was idling and for the hundredth time, I played with all the sensors and then the MAP sensor and the engine died? I swear I checked it out many times, but it seems the rubber accordion seal on the connector must have gotten twisted and was not quite snapped on tight. My scan tool showed the correct voltage readings, but I guess when the engine torqued just right it lost connection?
I can not believe it because it was one of the first things I suspected and always made sure it was tight, but I had to squeeze it so hard before I heard the plastic snap, I thought I was going to need some channel locks before I actually heard it snap on!!!
I maybe a little premature as I have only made a few hard runs for testing it out because of traffic, but knock on wood, I hope I got it!
After doing some data logging I probably have some other issues that made it worse, like a lazy LH o2 sensor with low cross counts (or a really slow scan tool "Auto X-ray"),but I am preying the MAP sensor connector was the major problem. My problem wasn't just heat related, but it chugged so bad it felt like it would throw you into the windshield just like you described so I thought I would just pass along my good fortune just in case?