Go out to your car, grab the clutch pedal with your hand and pull upwards towards you. You should hear a zip tie sounding noise. This is the stock mechanism taking up the slack in the cable. You also may need a new cable for a car that old. If you do get a new cable, do NOT get a parts store cable, only Ford or Max Motorsports (OEM manufacturer). MM actually sells a full kit with a new cable/quadrant/adjuster and might be doing a cyber Monday sale too.
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 ****.