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My 1992 ford Ranger 2.3 is not sparking, I tested intake coil pack it's not sparking so I swapped the front coil pack to the back and I had the same results. I had the ignition module tested by auto zone and they said its fine. What else could it be. I've already changed the spark plugs and the wires that go to them. What else could it be.... Help.... I don't know what else to check