2thousand5.4

Ok long story short I was lossing coolant, overheating, and had misfires on my 5.4 (never pulled the codes) I pulled off my intake manifold and there is a crack where the crossover meets the plastic on the passenger side, so that's what was causing the coolant leak and over heating. But I also found my #7 spark plug hole filled with oil up to the tip of the plug. I'm assuming this is what is causeing my misfire? Where could the oil be coming from? Dosnt look like its coming from the valve cover gasket, but I didn't inspect it to closely. I will check for a visable leak there tommorow when I shop vac all the coolant out of the valley. Any ideas what's causing the misfire and where the oil is from? Thanks


I will be replacing the intake manifold with a doorman unit, are they any good? The truck is the one in my sig