We recently purchased an 05' Mustang for our daughter and it didn't take us long to comment on the "not so smooth" ride this car has.. Kinda bumpy, choppy where I expected allot smoother ride from a newer car. It was purchased with 66K miles. Last week I purchased a set of Take Off wheels and tires as hers were 1/2 worn. Jacked the car up in the garage, changed the tires and when we drove it down the road, we were both shocked out how smooth the ride was and wrote this off as her tires. The next day, back in the car, down the road and the rough, choppy rides is back. Is it possible we have bad front struts and are unaware of it. We obviously extended the struts for a while changing the front tires and it was smooth. Now the car sits over night and it's rough again? I can't think of anything else that it could be... Has anyone heard of such a thing or can think of any other reason?

Thanks...