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Valve cover gasket
Most likely cause is the cam cover gasket is leaking.
No, only a blown head gasket or cracked head will cause coolant to mix with the oil. A leaking valve cover gasket will only cause oil to leak onto the engine block externally.
Yes, if it leaks oil through and on to the spark plugs, it will foul them and cause a missfire.
im guessing someone has told you that you have a 'leaking valve cover gasket'. the valve cover is normally on the top of the engine,above the pistons, sometimes its where you put the oil into. The gasket is where the cover joins with the block.
Leaking valve cover gasket.Leaking valve cover gasket.
The most common cause is a leaking valve cover gasket. Try tightening the bolts ever so slightly. If that does not cure the leak, and you know for sure the gasket is leaking, then it will have to be replaced.
Bad engine seal? Bad oil filter? Leaking valve cover gasket?
I would suspect that is a Valve Cover gasket leaking.
Valve cover gasket holds oil from the valves from leaking off the top of the head . Head gasket is lower and holds cylinder pressure between the cylinder head and the engine block.
Head gasket, timing cover gasket, or hose leaking.
Most likely the intake manifold gasket is leaking.