Intermittent misfires from distributor/distributor cap. Wires & rotor are new.

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Verified intermittent spark coming from distributor on only ONE cylinder by using timing light-every time engine misfires I don't get any flash from timing light. All other wires checked good. Brand new wires; coil, distributor cap/rotor and distributor replaced last year. Also, car is a 1988 Mazda, but similar to 1990 Mazda...