What causes a rough idle in Vauxhall Grandland?

I've noticed that my Vauxhall Grandland has been idling rough lately. It seems to happen randomly and there are no warning lights or codes. What could be causing this and how can I fix it?

Based on your description, it could be a problem with the ignition system. I would recommend checking the spark plugs, ignition coils, and spark plug wires. It's a good idea to replace these components if they are worn or damaged. Also, check the air intake system for any clogs or restrictions.

Another possible cause of a rough idle could be an issue with the fuel system. Check the fuel filter and fuel pressure to make sure everything is within the proper range. If the pressure is low, it could be a sign of a fuel pump problem. It's also a good idea to use a fuel system cleaner to clear out any deposits that may be causing issues.

In some cases, a dirty or faulty mass air flow (MAF) sensor can cause rough idling. You can try cleaning the MAF sensor with a specialized cleaner. If that doesn't improve the idle, it may need to be replaced.