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Peugeot 307 2003: Problems with the spark plug

My 2003 Peugeot 307 was running rough/missing when cold and under hard acceleration and going up hills. The mechanic said to change the spark plugs. If no change it would be the coil pack. I changed the spark plugs and found oil coating the firing end of one spark plug. Is this a major issue and would the oil on the spark plug be the cause of the missing issue?

A fouled plug could cause a misfire, but it should be resolved by changing the plugs. If one particular plug regularly fouls there could be a problem with that cylinder. It could be a number of things causing it, but you’d need to inspect the cylinder to know for sure.