Spark plug wires, like the timing belt, spark plug, distributor cap and rotor are wear items. While the timing belt may just snap and render you SOL, the ignition stuff tends to deteriorate gradually, like motor oil. It happens a little slower. Your butt dyno won't notice that your car's performance drops with the deterioration until a ways away when you notice your car doesn't pull as hard and the gasmilage sucks pee pee.
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