I've had my 06 GT for almost two years now, and the only thing wrong with it is that when I'm in third gear, the shifter... shakes? I don't know how else to describe it. It's not the subtle vibration that you can feel in other gears, it's a very aggressive vibration that gets more intense as the engine revs out. When I engage the clutch, the shaking goes away. I've always ignored it, but should I be worried about this? Has anyone else experienced this?