it may be one of your vacuum lines leaking and returning to the atmosphereic pressure The hissing noise could also be coming from an exhaust emissions part. This part is located on the fron right portion of the motor. I dont know the exact name but it attaches to the motor exhaust with two bolts, feel around this part when running, and see if it is leaking any exhaust from it.
A manifold leak is usually in reference to a failure of the intake manifold gasket. It can leak air, oil or coolant. It can leak to the outside of the engine or internally into the engine. A manifold leak may also refer to the Exhaust manifold that is leaking exhaust fumes from a bad gasket or a crack in the manifold.
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