Well do you have a stock cable or aftermarket? Because aftermarket cables are ALL problematic. Also look under the dash and see what sort of quadrant you have installed or if its OEM. When I got my 98 the previous owner had just throw a random quadrant in there and not shimmed it properly or anything. The pedal feel was terribad. You could also have a broken plastic quadrant.
Like I said describe exactly what it is doing and under what circumstances, if anything makes it better, if anything makes it worse.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.