I'm stumped! Last November, the wife's 2004 had developed a spongy clutch pedal. With a little diagnosis, I replaced both the clutch master cylinder and slave (air in the system with no external leaks). I bled the clutch as I normally would on any other car and all was good for a short while. Since then, I have warranty swapped the master cylinder and have the same issues as before but have to bleed the system every day and tons of air comes out. What an I doing wrong? All the line fittings are tight and I still don't have external leaks! Please help!