My truck has gradually been getting a worse and worse exhaust leak. I finally took a look at it and it seems to be coming from the passeger side valve cover. Exhaust is coming out at the front, outside part of the valve cover by the exhause manifold. I doubled checked the tightness of the manifold and its in good shape. The leak is definitely coming from under the valve cover. Is this as simple as a new valve cover gasket? Or is there something I should be more worried about. Truck is a 95 Tahoe, TBI.