Bad TFI module...
 

Thanks to this board for helping me diagnose and replace a bad TFI in less than three hours(including a tow) from breakdown to repair completion.

Before the car had even died I suspected the module, and luckily I had a new spare in the garage.

Had I not been a casual reader of the good information on this board, I am sure it would have taken much longer than the 20 minutes it took to get her purring again...