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Spark plugs, wires, distributor caps and rotors break down over time due to exposure to moisture, oil, grease, and underhood temperatures that can reach as much as 550 to 700 degrees. Worn spark plugs cause higher voltages, forcing the ignition module and coil to produce higher and higher voltages to overcome the resistance. The higher voltage breaks down the spark plug wires' insulation, creating an easier path to ground. This causes the ignition module and coil to produce even more voltage, creating even higher current temperatures within them. (Remember that higher resistance correlates to higher current temperatures and that electricity always finds the easiest path to ground.) This higher than normal resistance weakens transistors and electrical insulation within modules, coils, and computers, resulting in intermittent and premature failure.