CHECKING AND REPLACING
Visually inspect the spark plug cables for burns, cuts, or breaks in the insulation. Check the spark plug boots and the nipples on the distributor cap and coil. Replace any damaged wiring. If no physical damage is obvious, the wires can be checked with an ohmmeter for excessive resistance.
When installing a new set of spark plug cables, replace the cables one at a time so there will be no mixup. Getting the cables crossed up during installation may prevent the car from starting. Replace the longest cable first. Install the boot firmly over the spark plug. Route the wire exactly the same as the original, paying close attention to any clips or holders. Insert the nipple firmly into the tower on the distributor cap. Repeat the process for each cable.