Feels like the wheels are "skipping"? This happens to mine as well sometimes. Under hard acceleration or just after hitting a bump/pothole, and particularly in a turn, the wheels have to struggle somewhat against the road surface to gain traction. It happens while the wheel is 'unloaded', and the intermittent grip as it tries to stick to the road can be felt as a slight forward/backward "bucking" motion. But it's not enough to screech the tires. I don't see it as a problem tho.
. . Or maybe it's just my crappy Kumho's
