Thanks for info. Here is some more from my end. My O2 sensor is new and I have no visible vacum leaks. Some of my symptoms match a bad OVP as outlined in that article but not all. The sudden super low idle sounds like a failing OVP relay indeed but when the problem is happening the car also has nearly no power even off idle. I press the gas and it crawls forward as if runnign on 4 cylinders. Then after a few moments if "catches" suddenly roares to life and runs great! Does the OVP also control other functions that could cause a big loss of power when it fails?

By the way this seems to happen more when starting an already warm engine.

Thanks for the help,

Alex