Bibs...Possibly nothing, except not enough! In '00 I picked up an '87 Fiero Coupe (which I eventually turned into a Mini-Monster)...Bleeding the Hydraulic System for the Clutch was always a challange (M/C in the front trunk and Slave in the Rear Engine Area... many feet of lines). The only way to properly to Bleed this Design was to Jack up the Rear of the Vehicle (approx 2 ft off the ground) and after about 8 to 10 bleedings I had Pedal. You may have nothing more than a system that needs to be played with to get all the Air out!
Ed