Double check your dampner to make REAL sure its on far enough. Use a stright edge to align your pullies if your not sure. The dampner shouldn't wobble at all. It is probably still wobbling at higher rpm, you just cant see it. You should figure it out before you wreck the dampner, or worse.
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B.R.
L.X. 5.0 coupe
Cruise control,power mirrors,...and Thats it!