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2005 Mercury Mariner 3.0L where do I look for a P0302 vacuum leak?

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2005 Mercury Mariner 3.0L where do I look for a P0302 vacuum leak?

Vehicle: 2005 Mercury Mariner 3.0L

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You can spray brake cleaner near the intake manifold and see if there is an RPM change (see picture below) also spray brake cleaner from the back of the intake 

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