!998 Mustang GT- Bad Suspension?

Hi, my name is Rita and I own a 1998 Ford Mustang GT. As of current, I found out that my shocks and struts are leaking and need replacement sometime in the future. I just got back from a small road trip this morning, and my car did something it never has done before. I took a corner going about 6 miles per hour, and as soon as I got the car back on a straight road, it started to fish-tail out of controll, just like a car does when it is driving on an icy road. I don't know if my suspension is shot, or maybe my bearings or tie rods needs new replacement. If anyone knowns why my car fish-tailed the way it did, I would greatly appreciate any input on this subject. Thanks, Rita