If it's the 3.1 or the 3.4 that's typical for that engine, you will have to get it fixed immediately or risk hydro locking the engine and then you will be buying a new engine, figure between $550 to $650 to have it repaired.
Check your hoses from the power steering reservoir for cracks in them and also check the power steering rack on the firewall to see if the rubber seals on the ends of the rack are leaking, maybe the...
Replace the manifold gaskets.
Answer.
Word to the Wise: It would help to know what caused the leak. Bolts not tightened in correct pattern or torque, or just old age? Also, if manifold is aluminum,...