find a coil wiring diagram and trace the wires for the coil that is not firing. then check to make sure yours are connected to where they are supposed to go by doing a continuity test. if i am not mistaken, this is a waste spark ignition system so coil one and four, and coil two and three should be parallel wired. if so, coil one should have the same wires as coil four. but, i could be wrong.
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