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Are you checking voltage at the coil terminals by going positive to terminal and negative to ground?

You need to look for this thing in your left fender well.


Between terminal 4 and 2 there should be at least 10 volts. If not then you have a wiring problem someplace. After that, disconnect the Hall sensor connector from the distributor. Check voltage betwen coil terminals. Turn ignition on. Voltage should rise to 5 then drop to 0 volts in a second or two. If it doesn't then that doo-hickey in the picture is bad (ignition control unit).
 
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