An engine tune up typically includes a set of new spark plugs and spark plug wires, also called ignition wires. Your spark plug wires transfer power from the distributor to the spark plugs. If your engine is misfiring, idling erratically, hesitating, or surging, it may be time to replace the spark plug wires. A visual inspection can often confirm that the spark plug wires need to be replaced. The wires may suffer physical damage, heat marks, or corrosion. Damaged spark plug wires can arc to your frame or engine, keeping the power from reaching the spark plugs, and corrosion can keep them from making connection to your spark plugs. Spark plug wires from O'Reilly Auto Parts offer improved heat resistance, greater strength, and increased durability. Find the right set for your car, truck, or SUV.