Thank you for your help guys. Yall are great. The story ends like this:
I replaced the fuel pump relay and it fired up like a new car. I drove it a half mile and the oil pressure gauge bottomed out, the lifters started rattling, but it never got hot (can't figure that one out). After getting it home I checked the oil with the dipstick and it was cool. I drained the oil, couldn't get the oil pan off, but I noticed the oil in the bottom of the pan was warm. Put new oil and filter in, still no pressure (surprise, surprise). I replaced the oil pressure sensor, the pressure came back, lifters got quiet, and it's running better than ever. I'm completely stumped. You guys have been great. Thank you.