Your springs are probably fine if they aren't ancient.
The adjustable-ride Koni shocks (the kind that you have to remove to adjust..) have two spring perches. If your car sags too low in one corner or one end, check the spring perch setting on the shock body.
The lower spring perch will cause the car to sit lower, and the higher, higher. It's just a ring that holds the disc part the spring touches/sits on.