could be a loose bolt on the rear sway bar... that can cause those symptoms... 14mm deep socket should fix that... let us know.
__________________
Fly1 Zele|Stillen G3|FI CBE 18" RES w/quad tips|FI RTP|UpRev|IJDM LED Halos|6k HIDs|LEDs|JDM PW Shifter|NAVTOOL V2
|