Why is my Vauxhall Corsa's engine revving inconsistently?

I have noticed that when driving at a steady speed, my Vauxhall Corsa's engine revs up and down for no apparent reason. This is quite concerning and I was wondering if anyone has experienced this issue before and if there is a potential solution.

This could be due to a faulty mass airflow sensor. I had a similar issue with my Corsa and replacing the sensor solved the problem. I would recommend taking it to a mechanic to have it checked.

Have you checked your spark plugs? Sometimes, when they are worn out, they can cause erratic engine revving. You can try replacing them and see if that improves the situation.

I had a similar issue with my Corsa and it turned out to be a problem with the ignition coil. If your engine is misfiring, that could be a sign of a faulty coil. I would suggest having it checked by a mechanic as soon as possible.