An update....

I hadn't been able to look at the car until this weekend. When I did, I started the car and let it warm up then expected to see the tach register the idle RPM swings that I had been reporting earlier in this thread- but it never happened. I can't say it was rock-steady but compared to what I had been experiencing previously, it was. I was still getting a variation of around 20rpms but that's a heck of a lot better than it was before. And the wierd thing is that I hadn't done anything to the car since then.

Should I call this good enough? I'm not sure if I still have a problem or not...