How to troubleshoot a misfiring engine in a Ford Galaxy?

I've been experiencing a misfiring engine in my Ford Galaxy and it's causing a rough idle and decrease in power. Any suggestions on how to troubleshoot and fix the issue?

First, check the spark plugs and wires for any damage or wear. These are common culprits for a misfiring engine in a Ford Galaxy.

Next, inspect the ignition coils and replace if necessary. Faulty ignition coils can also cause misfires in the engine.