I have a 2000 Wrangler Sport manual with 96k miles. 3 months ago the clutch went out. I had a new clutch and slave cylinder installed. Last month the clutch pedal went to the floor and didn't move. The shop replaced the slave cylinder again and bleed the entire system. Yesterday the clutch pedal went really mushy and slow to return after being depressed. I towed it to the shop. After sitting all night, the shop mechanic calls me and says nothing is wrong, the clutch was fine when he started it up. They are bleeding the system again. Any suggestions on what is wrong?