Clutch is very soft, goes right to the floor and won't go into gear. Check for leak from master and slave cylinders and couldn't find any. When car was jacked off floor we could get it into gear but when put down wouldn't go into gear. The engine wants to stall while trying to get it into gear as well.

 

Did you try to bleed the clutch?

 

We haven't bled the clutch but there is no pressure at all in the clutch pedal. I can push the pedal in and it stays there until I put my foot under it to pull it back up. Should I bleed the master cylinder or the slave cylinder or both?

 

The system is closed until you either open it, it springs a leak, or the master cylinder or slave gives out. First make sure there are no leaks anywhere. If no leaks then replace the mc and the slave and obviously bleed it.