How to troubleshoot a malfunctioning car engine?

I've been experiencing issues with my car's engine. It's been making strange noises and losing power while driving. What are some steps I can take to diagnose and fix the problem?

First, check the engine oil level and quality, as this can greatly affect the performance of your engine. If it's low or dirty, be sure to change it as soon as possible.

Next, inspect the spark plugs and wires. These are often overlooked but can also cause engine problems if they are malfunctioning. Replace any worn or damaged parts.