Q: Replace intake plenum gasket. Hear hissing noise?

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I recently replace spark plugs on my 05 cts, and I replaced the intake plenum gasket. After I got it put back together and started the car, there is a hissing noise. Could this be because the new gasket hasn't heated and sealed or is it something else? No difference in power or idle.

My car has 160000 miles.
My car has an automatic transmission.

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