I was checking my plug wires today. I pop the one off to number 1 cylinder and I notice its all dirty inside the spark plug area. Kind of a rustish, brownish yellowish color. It smelt like burnt oil also. The rest of the plug wires and the spark plug area place were clean and had the normal cylinder head/ valve cover metal color to it. I couldnt get the plugs out as I don't have an extention that is that long, for some odd reason. Any ideas on what this is/was caused by? Thanks in advance.