Just checked the two oil separator hoses and they seem tight on their connections and in good shape. Any ideas? Is there a common place where there could be a big enough vacuum leak that would cause my problems? I have noticed a small amount of oil smoke from the back of the engine for a short while while it's warming up. I will be replacing my valve cover gaskets eventually but there was not much oil near the plug boots so I don't think that could be the issue. Is there something in the back of the engine that could be leaking that I have not thought of? The OSV doesn't seem to be leaking. Do you think I should do the valley pan gasket?