Leaky flex line...
It's on the pasg. side of the firewall, just behind the intake manifold. Check there first. Then check the actuator rod on the master cylinder inside the truck where it attaches to the pedal to see if it's leaking. Then check the actual clutch pedal bracket (sometimes they break when they get old) to see if its cracked or binding the pedal movement. Lastly, check the slave cylinder on the trans for leakage.
FYI, we replace those flex lines pretty often at work.
Ryan
