[SEVEND2]

Ok, just been driving it past couple of days, replaced front calipers and brakes becuase front clipers locked up. any how

say i am getting off the freeway/highway when i drive for a little while the front starts to shake bounce around and i exit the ramp and it bounces more when i aply the brakes, it bounces a little when i take off, and then smoothes out. when i come up to the next light i let off the gas and slow (with out hitting brakes) and the front bounces alot. and it that way till like it sits for a while a few hous and then its fine again till i drive it for a while again.
ANY IDEAS WHY OR WHAT COULD BE THE PROBLEM? SHOCKS, BRAKES??