Went to drive it tonight, it was pretty much undriveable. Stumbling, hesitating at all speeds and from the start.Not just after prolonged time driving like before. It was colder tonight, but no colder than some other times. The oil pressure gauge never did fall out, I guess since it ran so poor I never got it heated up enough to do that, thats obviously an unrelated problem now.

It hasnt died again yet since replacing the alternator.

I connected a pressure gauge to look at while driving and ducttaped it to my windshield. When I hit the accelerator and try to accelerate at low speed, the pressure stays on ~42psig while it stumbles, sags, doesnt go, etc.

When it does catch and speed up if you ease it up slowly, the fuel pressure decreases and may go as low as 25psig at high speed and high engine load under certain conditions, but its running pretty smooth then.

Seems to be idling pretty rough too, but all cyls are firing, get rpm drop when pull each plug wire off.

I may replace the ignition module for the hell of it before I give up on this thing.

The mitchell manual at the library has good diagrams of the ECM connectors, which pins are what, and the voltage they should run. My factory manuals may too, but I dont recall seeing that in them. I may try testing that. You can sort of check the ground voltages on the ECM that way, as well as inputs and outputs, etc without a scan tool and compare them to what they should be, maybe find out if there is a bad wire/connector somewhere, but thats a lot of work.