I'm having some issues with my EVE (Early Fuel Evaporation) valve on my 84K5. First problem is the little arm that holds it closed and open keeps falling off. Then there is also an exhaust leak coming from it. Looked at my LMC catalog,and they want $99.95 for a new one. So is there a gasket on it,that could have gone bad? Or do I need to replace it all together?