Thank you all for your responses. After I soldered the wire back together and also doing a tune-up with new plugs, dist cap/rotor, timing set, the cold running has improved quite a bit. The rpm still hunts at cold running only, but at a smaller range and only for a few seconds, probably between 1200-1300 (instead of 1000-1500). After it warms up, the idle is rock steady at around 800. I've had a check engine light before but on a totally different problem (vss=no speedo), and sure enough, it was the only stored code (14)in the computer. There was none stored for the intake air temp.