Ford Aerostar 94 stalled while driving won't start no spark

I was driving one day and my 1994 ford Aerostar 3.0 v6 suddenly lost all power and would NOT start after.. Took a spark plug out checked spark, no spark. Then I go to the coil and take the plug off the distributer with other end of plug wire still connected to the coil, I stuck a bolt in and again checked spark and there is none is the coil bad? Could it be a crank sensor? what next step should I do to get closer to understanding what is wrong