Many parts of your vehicle are subjected wearing down and your Jeep spark plug wire is no exception.  It's likely that the resistance in the wire will wear down.  Never try to substitute non-resistant wires for resistant ones.  Doing so could cause severe damage to your ignition system.  The insulation that surrounds your spark plug wire can crack and break.  If the insulation cracks, the energy leaks to the engine body instead of being sent to the spark plug. You may have to replace your spark plug wire if it has corroded.  Most corrosion can be seen near the connectors.  Because of the constant vibration, the spark plug wire may eventually break inside the insulation.  Some signs that your spark plug wire needs to be replaced are: miss-firing, poor fuel economy, and hard starting.  Our online catalog has the perfect replacement Jeep spark plug wire for your vehicle.  We offer wholesale prices on all of our part, including your next spark plug wire.