How do you change spark plugs on 1994 Buick century?

To change the spark plugs on a 1994 Buick Century, first, ensure the engine is cool and disconnect the negative battery cable. Remove the ignition coil or spark plug wires carefully, taking note of their order. Use a spark plug socket and ratchet to unscrew the old spark plugs, then install the new plugs by hand to avoid cross-threading, and tighten them to the manufacturer’s specifications. Finally, reconnect the ignition coil or spark plug wires and the negative battery cable.