1. The spark plug wires should be checked at the same time as the spark plugs are changed.
2. To check and clean the wires, disconnect each wire individually by turning the tip 1/2 turn and push it towards you. Disconnect the wire on the distributor cap. Check the condition of the wire contacts and seals. Wipe the wires. Do not bend the wire strongly, as the conductive core may break. If cracks, traces of breakdown and burning of the wire are found, replace it.
3. Check for corrosion on wire lug connectors and spark plug leads. Check the strength of the plug connection by putting a wire tip on the spark plug and shaking it. If the connection is loose, tighten the contact petals.