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Why does my 1998 Buick Park Avenue Ultra 3.8L keep throwing codes p0304 and p0171?

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Why does my 1998 Buick Park Avenue Ultra 3.8L keep throwing codes p0304 and p0171?

Vehicle: 1998 Buick Park Avenue Ultra 3.8L

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HI there,

Based on the lean fuel mix code and the misfire code on cylinder 4, it's likely you have an intake manifold gasket leak. Probably on cylinder #4. The vacuum and added air will cause the lean fuel mixture code to appear.

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