No clutch pressure after replacement of master and slave cylinder

The slave cylinder is inside the bell housing. No way to look at the operation of it

Bleed with car running or not?

Thanks for your answer. The clutch feels like it will disengage sporadically. The original issue was clutch not disengaging at all. It goes from soft to firm for no reason

PUMP the clutch pedal - if pedal returns to normal - BLEED system until you’re tired of doing it - then bleed some more! Problem with conventional bleeding methods is the clutch master cylinder doesn’t have much volume at all - it takes a BUNCH of bleeding to purge all air out .. Also be SURE the fluid level in master cylinder remains *sufficient* during bleeding procedure Good luck!

By bleeding, you are referring to pump clutch several times and while it is depressed crack open the bleed screw, correct?

That the usual (conventional) procedure used by DIYers.