Im thinking its the Master/Slave Cylinder, but Id like to get some more input before I
go spending the money to replace these.

1.) The throwout bearing is going
2.) When in neutral with clutch pedal out clutch is engaging and stalling the car
3.) It IS NOT leaking fluid
4.) Pedal movement is normal
5.) CLutch is relatively new
6.) The problem has recently started since it has been abnormally cold

I searched and found a similar story here: Clutch Problem...Maybe the throwout bearing?
He replaced/rebuilt both master and slave and was ok

 

If the vehicle is in neutral, the clutch being engaged wouldn't/shouldn't stall the car. Sounds like an internal tranny/fluid issue to me. Forget about the clutch for now, unless you can't get the car in gear, or pushing the pedal down while in gear causes the car to still move, or the clutch is slipping it's not your problem.

It's either that there's too much resistance in spinning the transmission shaft in neutral (really shouldn't be) Could be related to fluid being extremely heavy with the temperature, I know it's a pain in the absolute *** to shift my car for at least the first 4 blocks until I can get some heat in the unit, but I"ve never had it bad enough to stall the car. What was your idle usually at prior to all of this happening? Unless it was excessively low (or you have no emissions equipment/BAC, causing the ECU to have now way to compensate to keep the idle up), i can't think of anything other than a tranny issue.

 

I had a similar issue. I went and bought a new clutch from the parts store. Put it in, kit came with throwout bearing. Installed everything and it worked fine, for 36 hours. Coming home from work the 2nd day after putting the clutch in it started up again. Wouldnt come out of gear even tho the shifter was in the nuetral position. Then when i turned it off and restarted it, it wouldnt go into any gear.... Very frustrating situation while in traffic at rush hour. I went home and bought a new master and slave, and new braided lines from mazda trix. put it in, and have been good for the last 6 or 7 months? no issues. I would deff replace everything at once tho, as long as you can afford it. It sucks to fix the problem for a week or two and then have to tear it apart to fix it again...

 

This usually happens because the additional force required to disengage the pressure plate usually kills the seals in a worn out slave/master. His problem seems to be all together different though. The car shouldn't stall just sitting in neutral with the clutch engaged.

 

Can you see the slave rod move?

If so with the car in 1st gear and your foot on the clutch start the car. Did it try to move?

The only time I've seen a car stall by letting the clutch out in neutral was when I shattered 2nd gear in my na and a piece of gear bound up the trans. I put a wrench on the eshaft pulley and turned the engine backwards to free it up.

 

It idles at between 700-1000 with no emissions but the thermowax. And when it stalls its just
barely. If I give it some extra RPM it will fight it. But it has never done this before in like 6 years,
and Im sure it has been this cold in that time.

 

Have you driven it at all like this? If it doesn't let up after some driving, i'd say something in the trans has given out.

 

when i had this problem it was cause the pilot bearing busted and the ball bearings were getting inbetween the clutch and pressure plate. my car would be engaging into gear just sitting there and the pedal was acting really funny.

 

With the clutch pressed, while the tranny was in gear? In neutral, any kind of clutch failure should still result in the engine just spinning the transmission shaft freely with little resistance. That would include pilot failure as well.

 

Alright well I just got back from driving it. It took up to running temp, but it did eventually stop
engaging in neutral and seemed normal. Weird? Also, before it warmed up the gears were quite
stiff when disengaging. I guess my question now is, is this a sign of something failing?

 

What's the temperature? Sounds like my car when the weather's -5. I've just always tried to let it warm up as best I can and treat it rather ginger until it starts to loosen up, and i've had no issues in 10 years. If it's not that cold out and it starts doing it, i'd say check fluid.

 

^^
Its been below freezing all week, probably in the 20's (teens at night). I can check the fluid tomorrow and see what thats like.

 

Probably just the fluid then, **** is pretty heavy in cold weather and age certainly doesn't help. If it's pretty old you could try a flush/refill and see if it helps, otherwise I've always just kind of deal with it.

 

I had this problem and it turned out to be my throw out bearing.