Yes, if it leaks oil through and on to the spark plugs, it will foul them and cause a missfire.
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.
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.
Most common cause for a misfire on the 2.5L is oil in the spark plug holes do to leaking valve cover plug tube seals. You would need to replace plugs, wires, and valve cover gaskets in that situation.Most common cause for a misfire on the 2.5L is oil in the spark plug holes do to leaking valve cover plug tube seals. You would need to replace plugs, wires, and valve cover gaskets in that situation.
Bad engine seal? Bad oil filter? Leaking valve cover gasket?
I would suspect that is a Valve Cover gasket leaking.
Head gasket, timing cover gasket, or hose leaking.
Most likely the intake manifold gasket is leaking.
valve cover gasket