1996 XJ Clutch issues

I recently replaced the slave cylinder on my jeep because it would occasionally pull itself at stop lights with the clutch in, then stall. I bench bleed the slave cylinder and put it back together, and bleed it off for 4 or 5 days straight, still having the same problem. There are no visible leaks, and i am not losing any fluid in the reservoir. I have narrowed it down if you have the gear box in neutral, then slowly engage the clutch, it will not pressurized at all. Any help with this would be great, i am running out of ideas short of replacing everything. By the way, this is a 4.0L AX-15 with external Slave, Thanks!

Turns out, the slave cylinder was defective. Returned it, now i am jammin gears with the rest of them