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You probably have a vacuum leak somewhere. Check your hoses and intake manifold and throttle body gaskets. Many possible issues, the links provided below may be helpful, especially if you can get a diagnostic trouble code from your vehicle.

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โˆ™ 2009-09-02 22:58:24
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Q: What would cause a 1995 Cadillac Concours idle to surge or be too fast?
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