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A 1999 Chrysler Concorde may idle high due to several factors, including a malfunctioning throttle position sensor, a vacuum leak, or a faulty idle air control valve. An issue with the engine's computer or a dirty air filter can also contribute to elevated idle speeds. Diagnosing the exact cause typically involves checking these components and inspecting for any air leaks in the intake system. It's advisable to consult a mechanic for a thorough assessment.

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4mo ago

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