So ive got this weird problem with the clutch. When i first start out the truck sometimes i will have no clutch what so ever, but after driving for a little bit in town, i get it back, and some times when i shut it off, i lose it again, and sometimes it is fine. Other times when i first fire it up i have clutch and it is fine for a while then when i shift into reverse and back to first, i have none. The clutch, pressure plate, throwout bearing, and slave cylinder are all fairly new, so the only thing i can think of is that i got some air in the line somehow or the master cylinder is going bad?