I think I found the source of these problems. I threw the old air filter away a while ago-it was LAYERED with dirt. I took the intake off for cleaning and noticed a thick dusty film all the way to the throttle body. Would this be what set this off?

Also, when I disconnected that pipe that goes from the valve cover to the intake manifold, a bunch of coolant poured out. Head gasket?

Thanks again,
Jake