Since you will most likely have to remove the plenum, this site should help if you haven't done it before.
http://www.bcvettes.org/?http://www.bcvettes.org/howto/
Quote:
Originally Posted by Hib Halverson
As for the dual mass, if it's making noise, particularly, if, when you turn the key off, you hear a "rattle-rattle" just as the engine comes to a stop, the assembly needs to be replaced.
Good luck.
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Thanks Hib as this helps me too. I always thought the rattle when you shut it off was normal. I've been trying to chase down a vibration in the rear of the car and now I am wondering if that might have something to do with it.