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. Remove the first wire from the spark plug and the distributor cap, and connect one of the leads from the ohmmeter to each end of the wire. Factory recommendations are that resistance should not exceed 22,400 ohms per 39.37 in. (1 meter) of cable. The factory preferred resistance per 39.37 in. (1 meter) is 16,000 ohms.