Woody - the hall effect sensor in the distributor could give the symptoms. In my Olds it moves in the distributor so the common fault is frayed wires that let go - then the car won't run at all. Check your wires at the hall sensor and if they appear normal - remove it and hook it up to an ohmeter and try moving it around and heating it up and cooling it down and see if the ohmage changes dramatically while testing. Only other way to eliminate it as a culprit with the very intermittent symptoms is to replace it on spec. Good luck - hope you find it - whatever it is we will all want to know if it ever happens to us!