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Yes. If an intake manifold gasket was not installed properly or has somehow become damaged the engine will pull air through the opening.
The Intake gasket is leaking, NOT THE HEAD GASKET. Replace the intake gasket
most likely an intake gasket
it could be a head leaking or the intake manifold, if its coming from the very top its most likely the intake manifold gasket
Intake manifold gasket
sounds like it might be head gasket or intake gasket
Any internal coolant leak can cause a milky residue in the valve cover. Head gasket, intake gasket, cracked/warped head, cracked intake are possible causes.
If you have coolant on the top of the engine it could be a leaky thermostat housing or a leaking intake gasket.
Yes, a bad intake gasket can cause coolant to mix with engine oil. Indeed a bad lower intake can cause this. Who ever said the head gasket is a moron. You can't assume this all the time. This is why you have diagnostic tools such a a compression tester and a leak down tester. For example, my compression is good, and the valves are not leaking past the specs. However, there is air coming from the lower intake. The gasket is bad. Also, it's always suggested that you change the oil after the gasket just to be sure no water got in the oil pan from doing the gasket.
If the intake manifold gasket has failed then it can cause many issues. Air leaks, known as vacuum leaks, will cause an erratic idle, stalling, and fuel problems.
broken engine gasket.
If the leak is bad enough i believe it can but i would check your valve cover gasket first.