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this can be caused by a weak battery check battery and charging system to verify a good working system. it could also be a weak coil not being able to supply enough output voltage for the ignition system. you don`t say if its weak coming out of the coil or at the plugs. if spark is weak at the plugs it could be a bad cap/rotor, ignition wires. it could also be an ignition module problem or pick-up coil in the distributor.
I guess you could have the ignition analyzed on an oscilloscope. Maybe a tech could see something then. I always heard the only gap was the spark plug gap-the rotor has no gap-are you sure you got the correct rotor? And does it touch the top distributor cap coil wire tower?
Let us know. It is a mystery worthy of a solution.
Fouled spark plug? Bad wire? Rotor / cap new? Check those things out, wear a thick rubber glove, take the wire off the non working plug, put a screwdriver next to the wire (while car is running) and see if a spark is made. If it is, your plug is bad. If no spark, replace wires. Still no spark? Change your rotor and cap. Still no spark? Ignition module. Following those steps will save you some green.
I had the same problem with my 85 cj7 this week, I relpaced the ignition control module, plugs, wires, cap, rotor and the the coil; still had no fire to plugs. the problem turned out to be my distributor, replaced it today and she fired right up. Most likely it was the pick up module in the distributor that went bad.