it sounds like the hydraulic system (slave and master cylinder) needs to be bled again. I had the same kind of problems. i could bleed it enough to get the truck drivable and then after 4 or 5 days the clutch would just completely go away (clutchless shifts are a good thing to learn). As it turns out the company that remanufacturs botht the master and slave cylinder for advanced auto parts and autozone were making junk. neither had good seals and so they would allow air in after a few heat cycles causing the problems/.
I finally bought brand new master and slave cylinders from Wagner and haven't had problems since.
I finally bought brand new master and slave cylinders from Wagner and haven't had problems since.