89 740 GL won't start

I have eliminated fuel as the problem and also have a new coil. It will turn over fine but will not start. What is the most likely cause of lack of spark. I was driving down the road and caput, and rolled to a stop. I remember recently reaching into the engine compartment in the area behind the distributor and the engine would cutout or stumble severely. Could the crank speed sensor do this. Does it control the fuel and spark?
 
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