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????