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Hesitation and rough idle on a 2001 Volvo S40 can be caused by several factors, including a clogged air filter, faulty spark plugs, or issues with the fuel system, such as a failing fuel pump or dirty fuel injectors. Additionally, problems with the engine's sensors, like a malfunctioning mass airflow sensor or throttle position sensor, can disrupt the air-fuel mixture, leading to rough performance. Vacuum leaks or issues with the ignition system may also contribute to these symptoms. Regular maintenance and diagnostics are essential to identify and resolve the underlying issues.

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1mo ago

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