bouncing hard in the back while driving

1998 FORD EXPEDITION
190,000 MILES
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TEHUERY
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My 1998 ford expedition is bouncing hard in the back while driving and when the car is off you can hear air as if it were coming from the back tires,

It's bouncing hard in the back while driving and when the car is off you can hear air as if it were coming from the back tires, can you help? What does this mean?
Aug 24, 2012 at 3:22 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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