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To fix the idle on a Pontiac Bonneville, first, check for vacuum leaks in hoses and intake manifold gaskets that could affect airflow. Next, clean the throttle body and idle air control (IAC) valve to ensure they operate smoothly. Adjust the idle speed if necessary, using the idle adjustment screw, and reset the engine control module (ECM) if applicable. If issues persist, consider checking the spark plugs, fuel injectors, and sensors for further diagnostics.

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1w ago

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