Why is My Vauxhall Astra Engine Misfiring?

My Vauxhall Astra's engine seems to be misfiring, causing a rough idle and decreased performance. I've tried changing the spark plugs, but the issue persists. What could be causing this and how can I fix it?

There are a few potential reasons why your engine may be misfiring. It could be due to a faulty ignition coil or a clogged fuel injector. Another possibility is that the timing belt is worn and needs to be replaced. I would recommend getting a diagnostic test done at a trusted mechanic to pinpoint the exact issue.

Make sure to also check your air filter and clean or replace it if necessary. This can also contribute to engine misfiring. It's important to stay on top of regular maintenance for your Astra to avoid these types of issues.

If you haven't already, I would also suggest checking the fuel pressure and the condition of the fuel pump. A weak fuel pump can cause misfiring and other performance issues. Again, a diagnostic test will be able to confirm if this is the case.