Spark plug wires are common tune-up items, and on most vehicles the replacement process is actually relatively easy, so long as you order the correct parts from the distributor. Spark plug wires are the most common failure in ignition systems, as they carry the spark for the greatest distance and are subject to all kinds of wear and exposure. Fortunately they aren’t too expensive to purchase and install, and just about any shop can take care of the replacement with relative ease.
It should be noted that they are not found on all vehicles, especially 2000 model year cars and newer. Diesels don’t use spark plugs (though they do have glow plugs), so if you have a diesel engine spark plug wires won’t be of any concern.