I've been working on my 92' the last couple days, first the master clutch went on me, I replaced it and the slave with rebuild units. The weird thing is when the car's not running I can get good pressure on the clutch pedal but once the engine is started the pressure drops and it doesn't seem to be disengaging the clutch. At first I thought I had air in the MC but I think I've gotten it all out. Could there be something I'm missing or is it the clutch that's possibly gone bad on me?