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I doubt that it is the intake manifold. If it were, the car would likely not run. My intake (upper) manifold failed, and the car stopped running almost immediately. This happened with a '98 3.8. The coolant circulates around the throttle body to keep it cool and the plastic (yes, GM uses a plastic upper intake manifold!) in that area especially is susceptible to high temperatures (Plastic? Susceptible to high temperatures!? Imagine that!!) and breaks. Anyway, when this happened to me the car would not run. When a large amount of coolant enters the combustion chamber the compression changes to the point that the engine cannot run. Long story short, the leak is probably smaller and therefore somewhere else, i.e. a head gasket.
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