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				 Vibration at 2200-2400 RPM 
 
			Last month, my 1998 Boxster started to vibrate at 2200-2400rpm. It does not matter if the car is in gear or not. Temperature seems to make no difference either.
 Metailic vibration is heard and felt at exactly 2200-2400 RPM, all other RPMs are smooth as glass.
 
 Has anyone ever heard of something like this? There is no unusual smoke or smells.
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