It got so bad yesterday (cutting off every time I idled - and I live in a busy city with a bunch of "oblivious" drivers! - that I went to a mechanic who determined I had a "bad vacuum leak" and he demonstrated this for me - not that I had an inkling of what he was talking about!
So, is the vacuum leak solution the cure for my symptoms - which were:
no pick up; engine sort of revs at around 40 or 45 mph, then I let my foot off the gas and it corrects itself and I am able to speed up.
As for the coolant light - the coolant level is fine - so it must be a short or something. Big whoop - as long as it doesn't cut off in traffic and I can run the AC I am good to go - for now!