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Check your PCV valve. This valve helps relieve pressure within the engine. It is usually located somewhere on the valve cover. How it works is when the pressure within the engine builds up, the valve opens to relieve some of the pressure so it does no push against internal parts which can cause gasket failure. If your PCV valve is not opening properly the first thing to go would be the vacuum hoses. Just replace the PCV valve, it is cheap and easy, good place to start.

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Q: What would cause vacuum hoses to continually pop or leak on a 2003 Mercury Sable?
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