What can cause rough idling in a Ford Focus?

I have a 2015 Ford Focus and it's been idling really rough lately. The engine seems to shake and it feels like it's going to stall. What could be causing this issue and how can I fix it?

One potential cause for rough idling in a Ford Focus is a dirty or faulty fuel injector. This can cause an inconsistent flow of fuel to the engine, resulting in rough idling. I would recommend getting your fuel injectors cleaned or replaced to see if that resolves the issue.

Another possibility is a vacuum leak in the engine. This can happen due to a cracked or disconnected hose, causing air to enter the engine and disrupt the air-fuel ratio. I suggest checking all the hoses and connections in the engine and repairing or replacing any damaged ones.

It's also worth checking the spark plugs and ignition coils, as these can become worn or faulty over time and cause rough idling. If needed, replace these components to see if it improves the engine's performance.