Well, the car has been running for about a month now. I threw a lean code several weeks back so I added a little fuel in the MPI. I cleared the code last night and it hasn't come back yet. I still have a P0090 code (fuel pressure regulator circuit). I'm not sure where to begin on that one. I replaced the fuel pressure solenoid and the fuel pressure regulator itself. I'm wondering if it's a fuel pump issue. It doesn't seem to have any adverse effect on the way the car runs. Other than a slight stumble just above idle the car runs great. She'll be parked for 2 weeks while I'm in Topeka. When I get back I should be ready to go get a dyno of it and see where I can start tuning.
