[unreal808]

Cause Solution
Air or water in clutch hydraulic fluid - Bleed clutch fluid and replace.
Master cylinder is leaking.- Replace master cylinder.
Slave cylinder is leaking. - Replace slave cylinder.
Clutch pedal rod is worn out. - Replace rod.
Master cylinder pushrod is incorrectly adjusted. - Readjust master cylinder rod.
Incorrect clutch pedal free play adjustment.- Readjust clutch pedal free play.
Transmission is loose, resulting in movement when clutch is depressed.- Tighten loose transmission bolt(s) by front engine mount.
Master cylinder rod too short for current clutch setup. - Lengthen master cylinder rod.
Master cylinder worn out. - Replace old master cylinder.
Slave cylinder worn out. - Replace old slave cylinder.
Poor lubrication on clutch fork and/or pivot ball. - Grease moving parts well.
Worn clutch fork pivot ball. - Shim pivot with one or two 3/8" washers to regain missing travel.
Poor lubrication on pilot shaft or throwout bearing. - Grease throwout bearing very well.
Worn or bent clutch release fork. - Replace fork.
Worn clutch pivot ball. - Replace ball.
Worn out or incorrectly installed clutch / flywheel. Replace clutch / flywheel with new clutch and flywheel machined to correct specifications.

I would try some Red line first but, you will ultimately need a rebuild.