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My bad, I replaced the pick-up coil with the ig. mod. The pick-up coil might be bad.
To check it on my '92 fullsize, I thinking it should be the same on your truck:
1) Connect an ohmmeter to the pick-up coil lead, the wires that go from the coil to the ig. mod., and ground out the other meter probe. The meter should read infinite at all times. Be sure to flex the wires while your taking the reading to see if they change at any position. If it doesn't stay on any infinite reading the whole time, it's bad.
2) Next, put the meter probes in both of the connectors on the plug of the coil wires. There should 500 to 1500 ohms between these two wires. Again, flex the wires to see if the reading soesn't change drastically.
Hope I helped.
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