What are common common issues with the Ford Focus's fuel injectors?

I've been experiencing some rough idling and hesitation when accelerating, could this be related to the fuel injectors? How often should they be replaced?

Yes, it is possible that your fuel injectors are causing these issues. The fuel injectors should be replaced every 50,000 miles, but it could vary depending on your driving habits.

It could also be a problem with your spark plugs or ignition coils. Have a mechanic run a diagnostic test to determine the root cause of the issue.

Make sure you're using high quality gasoline and consider using a fuel injector cleaner regularly to prevent build-up and prolong the life of your injectors.