Clutch Problems

[79Bandit]

First off let me say i dont have a lot of knowledge on jeeps so i need some help with someone who knows what there talking about.

My problem is on my 92 jeep cherokee carolina edition - i belive it has the inline 6...if thats an option for that year lol.. anyways sometimes the clutch just goes out completly you can press is straight to the floor but theres no tension there and it rises back, so your going down the road go to shift to 3rd and cant because the clutch is gone out you have 2 options a turn the car off then place it in third and turn the key to power (kinda like poping the clutch in without the pushing element) or you can rev the engine way up once and it will pop out then you can rev it again while forcing it into the gear.

i thought it had air in the lines so i bled them no results anyone know what it could be? Maybe master cylinder?