The seals I'm talking about are between the upper and lower portions of the intake manifold. The manifold is made of two castings, an upper and a lower. There are at least 4, maybe 8 rubber o-ring like seals between the two castings. They're forward and aft of the throttle body gasket. You gotta look deep down in there to see them. Spray some carb cleaner in there though, and I hear a definite idle speed change.