How do you change plugs and wires 2002 optima 4 cylinder?

To change the spark plugs and wires on a 2002 Kia Optima with a 4-cylinder engine, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the ignition coil cover and the coils by unscrewing them and disconnecting the electrical connectors. Take out the old spark plugs using a spark plug socket, and replace them with new ones, ensuring they are gapped correctly. Finally, replace the spark plug wires, connecting them to the correct cylinder and securing everything back in place before reconnecting the battery.