clutch problems

[VisionRx7]

I just installed a new spec stage 4 clutch 6 days ago. All was good until today. I was driving it and all of a sudden the pedal went to the floor and it wouldn't go into gear. It was also making a rattling sound. I put my foot behind the clutch pedal and pulled it up. I was able to get it into gear and get it to my work. I checked out the master cylinder and it was empty. I added more fluid and bled the system. It was still doing it. I then pulled the slave cylinder off and lubed it up. I also pulled the boot off of the tranny where the fork comes out and looked in. The throw out bearing looked to be fine and still attached to the fork as far as I could see. It seemed to be alright after I put the cylinder back on from greasing it. I drove it for about half of a mile and it started to do it agian! Does anybody have any ideas?
Thanks for your help,
Jesse