Not yet. The car is in storage until springtime.
Before storage I replaced the O2 sensor and still had problems. Since then I started another thread, which I believe is related to this problem:
AIr Pump Won't Shut Off
This problem presented itself about the same time I was having O2 sensor problems. I think the problem is that I spliced an O2 sensor that works in olders models but is not appropriate for my vehicle. I've been researching the sensor part numbers and I find that the universal sensor for each application is different. My next step will be to buy the proper O2 sensor. Hopefully all problems will then go away.
I'd hate to think that I need a new ECM. How much did it cost you? How can it be best diagnosed?... dealer?... indy? It would sure be nice if I could swap it out for just a day for diagnostics.