Check your spark plugs for oil leaking into the spark plug port. I noticed my protege acting erratically and had a misfire code so I replaced my plugs and all was well. There's a gasket ring that surrounds the spark plug port in between the head and the valve cove that gets worn out. Check your entire valve cover gasket, or seal, and see if that might be the issue. Also check your oil to see if its been dropping and add accordingly.