A high idle on a 1997 Nissan Sentra can be caused by several factors, including a vacuum leak, a malfunctioning idle air control (IAC) valve, or a dirty throttle body. Additionally, issues with the mass airflow sensor (MAF) or a sticking throttle can also contribute to elevated idle speeds. It's important to inspect these components for cleanliness and proper function to diagnose and resolve the issue effectively.
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