How do I fix a malfunctioning Astra engine?

I recently noticed that my Vauxhall Astra's engine is making strange noises and sometimes it doesn't start. How can I troubleshoot and fix this issue?

First, you should check the spark plugs and ensure they are clean and functioning properly. If they are dirty or worn out, replace them with new ones. Also, check the fuel filter and replace it if it is clogged. If those steps don't solve the issue, it is recommended to take your car to a mechanic for a thorough inspection.

Another possible cause of a malfunctioning engine could be a faulty ignition coil. You can test this by using a multimeter and checking the resistance of the coil. If it is not within the recommended range, replace it. Additionally, make sure to regularly check and change the oil, as dirty oil can also affect the engine's performance.

If the engine is still not running properly, it could be an issue with the fuel injectors or the throttle body. These components can become clogged with debris and affect the engine's performance. It is recommended to have them cleaned or replaced by a professional mechanic.