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How to troubleshoot engine problems on an Audi A4?

I have noticed a decrease in power and acceleration on my Audi A4. What are the potential causes and how can I fix them?

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Check the engine air filter for any clogs or build-up. A dirty filter can restrict air flow and decrease power. Replace the filter if necessary.

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Inspect the spark plugs for wear and replace if needed. Old or damaged spark plugs can cause engine misfires and reduce power.

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