Car stalls when I turn A/C system on
 

I just recently bought a 1991 Miata and I love it! The one issue I am having right now is I got the A/C system recharged and all the A/C components changed out to new, but when I turn on the A/C system the car will rev up to 2 grade and then go back down to 600 and stall out. I am honestly really lost right now on what it could be to fix it. If anyone knows the answer on how to fix this please let me know. I have seen another thread on here about this with the same issue but it was from 2004 it looked like, and no one really posted what the issue was about it.