Head gasket seals the engine as well as the pathways of oil and coolant. While intake manifold gasket is responsible for delivering the mixture of air and fuel to the cylinders. I think the problem is coming from a head gasket leak due to coolant leaks that result in engine steaming or overheating. But some motors are prone to coolant leaks in their intake gaskets. With this, I think its best to visit your trusted car shop for a thorough diagnostic to avoid problem that could ruin your car completely and risk your safety. Hope this helps!