Yes
If the usual problems don't reveal the prolem have your mechanic check the intake manifold. These engines have a tendency to loosen the bolts on the intake manifold and the leak will damge the gasket. In time it will get worse.
Need to check the 4 corners on the intake manifold. It is common for the intake to leak engine coolant.
bad vacuum hoses or leaking intake manifold gaskets.
If it is a v-6, I would say the intake manifold to head connection.
Upper intake manifold plenum leak/crack most likely. If its blowing out coolant then you probably have a bad head gasket.
It can.
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.
Intake manifold leaks will cause the engine to idle rough and get poor fuel economy. An exhaust manifold will have no symptoms other than the sound of the leak.
replace the intake gasket set
Yes, you need to replace your intake gaskets.
Old/worn intake manifold gasket and/or damaged/broken/mis-routed hoses attaching to intake manifold.
On most vehicles, yes.