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					Originally Posted by Jager  The idle bounce could be a number of things but I would get the throttle body cleaned first then test for vacuum leaks. 
 The rattle could just be chain tensioners.
 
 I have no direct experience with IMS bearing failure but you will have a significant leak on the underside of the motor, then at some later point in time there will be nasty grinding sound just before the motor chews itself to pieces.
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I agree with vac leak / dirty throttle body.
		 
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