Somestimes i feel the rear end of the car shake sideways or wobble left to ride when i go over a hole or bump. What could this be, the car is a 01 GT, got it less than a month a go, everything is stock. I was afraid that the rear shocks were blown, but the car doesn't bounce or feel bad, although if i lean on the trunk and push it down the suspension feels a bit soft than my friends GT. What do you think? Thanks for any help.