OK, I'm looking for advice regarding my magic, self-healing clutch actuator.
('93 Sahara, 6-cylinder engine, 5-speed tranny, 115,000 miles.)
For the last 3-4 months, I've had this problem occur on irregular occasions. The clutch will fail to disengage when the pedal is pressed to the floor. (Can't pull the lever out of gear, the vehicle moves unless I apply the brake.) Pumping the clutch pedal several times restores function.
The first time this happened, I diagnosed a hydraulic leak, air in the lines, etc., and took it to my mechanic (who has been very good with other work, so I trust them). They went over it and couldn't find anything wrong. Their best guess was an air bubble in the hydraulic line. They recommended driving it until something actually broke so they could find and fix it.
The problem didn't recur for several weeks. There were a few occasions where the engagement point moved down close to the floorboard, but no more total failures to disengage. (And the engagement point moved back to normal.)
Then yesterday it totally failed again - creeping with the pedal on the floor, etc. I pumped it up several times, the problem disappeared and I drove home. It did the same thing in the driveway as I was parking it, but this morning, it's just fine. I drove it all the way (25 miles) to work, and it behaved perfectly.