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Your 1999 Civic may be stalling at a light with RPMs dropping below 500 due to several potential issues. Common causes include a dirty or failing idle air control valve (IAC), which regulates airflow to maintain a stable idle, or a vacuum leak that disrupts the air-fuel mixture. Additionally, problems with the fuel system, such as a clogged fuel filter or failing fuel pump, could also contribute to the stalling. It's advisable to have the vehicle checked by a mechanic to diagnose and resolve the issue.

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AnswerBot

6d ago

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