To do this successfully, they need to be covered in thick insulation to prevent high voltages jumping off the wire before it reaches the spark plug and a rubber boot at each end. Consider hiring a local mechanic to diagnose and fix the problem.Spark plug wires deliver thousands of volts – up to 45.000V, depending on the application – to the spark plugs. If you notice bad idle backfire or other performance problems, you have likely put a wire in the wrong place.It has less of a ground at the plug end, making you a more viable path. There are tens of thousands of volts generated in the ignition system, and an improperly seated wire is much more likely to shock you.
Never touch a wire on a running engine, or you might receive a painful shock. If your engine does not run, runs very roughly, or backfires after replacement, then check for improperly run wires, wires run to the wrong cylinder, wires that are grounded along their length, wires that are not properly seated in the boot, or boots that are not properly seated to make contact with the coil or plug. You may notice new power and efficiency, especially if your old wires were heavily worn down. After you have carefully installed the wires in their correct places, start the engine. In this case, you can buy larger diameter standoffs to attach or widen the holes in the looms. If replacing wires with a high performance coil and kit, be aware existing looms may not fit. Thus, make sure to rout the replacements properly through the loom, well away from resting on any metal. A wire resting on the engine or a wire crossing another can short or leak or break down due to heat. Spark plug wires usually rest in wire looms or standoffs. Keep the wires away from exhaust components that might damage them, and keep each wire from crossing over another wire. Running from a coil to the wrong plug will prevent the engine from running, which could lead to damage. Plug wires run from the distributor or coil to the plug, and must be replaced exactly as factory run. The boot will be fully seated onto the plug when a small click is felt. 
Before installing the boot on to the spark plug, add a small amount of dielectric grease to the spark plug boot. Connect the new wires in the same order as you removed the old wires.
Some spark plug wires can be purchased individually from some auto parts stores fully assembled. Don't start cutting the wires to a certain length unless you know for certain that new ends can be safely put on the wires you cut. Oftentimes, the manufactures do not allow repairs on their wires. Stay away from most of the "make your own length" kits unless they are high quality and you are very comfortable installing your own boots. Check the length before you start, and it'll be okay. This allows them to sell more assemblies of wires to fit more applications, so you may have slight differences. Different makers have different lengths, and replacement wires are often sold longer than the originals. Try to stay as close as possible to the old wire length. You must be aware of the length of the wire you are replacing compared to the old wires on your engine. Thus, if you have a six-cylinder engine, you must purchase all six wires, all of which will vary in length. You must buy an entire set, even if you only need to replace one wire. Any or all of these damages can indicate that you need to replace the wires. You may encounter frays, cracks, and even burnt spots. Depending on the conductivity of your wires, there might be sparks leaping from the whole front of the car, or just from one spot. 
You may need to replace the wires if you see sparks jump to the ground at night with the hood up and engine running.The engine symptoms can also be caused by faulty spark plugs and other, deeper issues, so you first must prove that your wires have gone bad and need to be replaced. Be aware of some of the obvious engine symptoms: rough, bumpy idling, and a deep "coughing" sound.If you see sparks jumping from the wire to the engine, it is a sign that you need to replace the wires. Look for damage to the wires, and listen for engine malfunction. Age alone does not necessarily indicate that you need new spark plug wires. Determine whether or not you need to replace the wires.
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