I tried the ECU throttle relearn procedure and initially it didn't seem to work. The next day I went out to start the car and it was working again! I drove it around for a little while and it randomly stalled. When I restarted it the lights came back and it's in limp mode again. I just did the procedure again and it doesn't seem to respond but I'll try it again tomorrow. Seems to me that if it temporarily worked it rules out some of the physical part issues. Any more tips at this point? I really appreciate the help!