[s-cars] Harmonic Vibration?

[TM]

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Has anyone experienced vibrations coming from the 2.2T engine in specific R=
PM ranges?  My engine seems to vibrate b/t 3200 -3800 RPM (significantly) t=
hen again after 6500 RPM (very slightly).  Runs really smoothly when it is =
out of those ranges.    Happens in all the gears and in neutral (even happe=
ns when the car is stopped and in gear with the clutch engaged.  I have che=
cked all of the heat shields and the exhaust system - everything is tight. =
 If it is a harmonic vibration, can it be fixed by tearing down the bottom =
end of the engine and re-balancing everything (harmonic balancer, crankshaf=
t, rods/pistons, and flywheel)?  i.e. leaving the top-end un-touched?

Any input would be much appreciated.  Thanks.


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