Do this: Take a spark plug and put it in a plug wire, and hold it against a known good ground and crank the motor. Do it for each plug wire, one by one.

If there is ANY spark, on ANY of the wires, it's not the ignitor.

I was only getting the tiniest of sparks on #4, but the ignitor was fine.

My Truck: 1987 XtraCab DLX 22R 4WD 5 Speed Manual
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"Speed has never killed anyone. Suddenly becoming stationary, that's what gets you." -Jeremy Clarkson