Jim, I have your exact car. It could be the o2 sensor but my guess. for what it is worth, is maybe no but what do I know, probably wrong. The o2 sensor for the car is cheap, if fastlane here does not have it, autopartsauthority.com has it for $18. There are 2 other components I would try also. One is the idle control valve, as I recall to the right of the thermostat. It is VERY accessible. Remove it and clean it. I will also mention what I know you know from your other posts-- vacuum leak. other idle control unit, then ecu.