I saw this post on the PCA Tech website today:
"A vibration at this RPM that can be duplicated every time while parked is do to the Twin flow valve in the intake. More specifically closer to 3000 rpm's this valve is actuated and a slight vibration is felt. This is normal and is in all the non "S" models at this range.
Scott Slauson - PCA WebSite - 12/3/2005"
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