Steve, John, et al.,
Thanks so much for your advice from earlier posts. I think it was the air hose near the bottom of the MAF that was disconnected after replacement. Boy, stuff is hard to see in there. Also, it's hard to make your hands work at all in freezing weather. I guess this is why we always paid someone else before.
But! The good news is that the engine will now run at an idle, with the new MAF installed and the hose reconnected. Tomorrow morning I'll test it by driving it to work, to see if the original problem (stalling at stops after the engine is warm) persists.
I'll let you know...
(Oh. We never could find the IAC valve, the cleaning of which will be our next step if the stalling starts again. I read that it's right above the throttle body, but I don't know what that is either. It's very sad. Is there an "engines for dummies" kind of site that might provide simple labeled pictures???)
Thanks again, Emily