Oil on spark plug of cylinder 4 - jeep liberty kj 2006 3.7

ioniamichael

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Hi friends, about three days ago my engine started to jerk.
After a computer check, I discovered that cylinder number 4 was fake.
I took out the spark plug of that cylinder and it was full of oil.
I replaced the spark plug, cleaned the area with carburetor spray and the problem went away in 3 days.
Today the problem is back again in the same spark plug, again full of oil.
At first I thought maybe its was covering valves gasket problem, but then I found out that the spark plug does not go through it, but goes directly to the engine head.
Ideas What else can make this happen?
 

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