I have a problem...Answers anyone????

Ok....so I have a 1996 chrysler sebring lxi coupe. It has approx 138300 miles on it and I have noticed recently that when I accelerate over 65 mph especially up hills, the car "jerks" until I am back on flat land. Also when I stop I notice that it rumbles like if it's on a hill. Any answers to wha this might be???