[rdass623]

when holding the pedal to the floor is there a loss of hydraulic pressure (i.e. does the clutch begin to engage more)? this would indicate bad seals in either the clutch master cylinder or slave cylinder. is there an adjustable rod on the slave cylinder? which you can use to apply more pressure to the clutch pivot arm? what is the clutch pedal height? if it is too low it may need to be adjusted to give you full disengagement. last, did you do any work to the system before it began to give you problems? generally the first point of failure on hydraulic clutches is the slave cylinder.