1. Inspect the high voltage wires with the engine running. Carry out inspection in a dark room, then it will be easier for you to detect sparkling damaged places.
2. Check if the wires are reversed.
3. Disconnect wires from spark plugs.
4. Inspect the wire contacts, if necessary, clean the contacts from corrosion or replace the wires.
5. Connect the wires to the spark plugs.
6. Wipe the wires all over and inspect the wires for cracks or wear.
7. Disconnect the wires from the distributor or ignition coil. Check the status of the contacts.