if it's right where the valve cover meets the head, just pop off the vavle cover, and clean teh gasket. A lot of times it will just be a little grit on it that isn't letting it seal. Might need to replace it. Just get one from checker. OEM is pricey as hell in comparison. Biggest thing I can say is, wait til the engine has gotten to cool off for a while before doing it. I've seen one of my friends break 3 vavle cover bolts trying to take them off a hot engine.