1996 Nissan Maxima

I have a 96 nissan maxima se with about 150,000 miles. When i'm driving at any speed and hit a bump, or even a speed bump, tha car starts to bounce and rock from front to back more them normal. And when i'm driving on the highway and hit a bump or pothole, the car sways way to much, almost loosing control and going into the next lane until I point the car straight again. What needs to be checked?
July 18, 2006.

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