On the 603.912 engine (non-turbo) Ther are six grommets that link the intake manifold to the air cleaner. The car has pretty high miles on it and many of the original rubber pieces are getting or are already VERY hard and brittle. While the car is idling there is a considerable amount of shaking and I am worried that the boots are not sealing correctly around each intake runner. I don't hear any vacuum wooshing, but that doesn't mean it isn't there. Has anybody had these go bad on their car?

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2003 Dodge Ram 2500 Cummins - Georend fully built trans, Banks Big Hoss Bundle, Smarty Tuner, 5" turbo back exhaust. 500 HP and 1100 ft/lbs to the ground.
1979 Mercedes-Benz 300CD - Lost to a four car pile up on 275, Thank You Michigan Drivers.
1986 Mercedes-Benz 300D - Sold, Euro non-turbo car.

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