Given the design of the A-10, with it's straight wings and large vertical tail area, it doesn't like to spin. That's not to say it can't, just that you would need to be really extreme with your control inputs to get it to spin. What sequence of control actions are you taking to try and get it to spin?
As for your second question:
Again, because of the A-10's design, given enough altitude, the A-10 will always recover from a stall. Some aircraft, particularly with high mounted horizontal stabilizers, suffer from a phenomenon called "deep stall."
This looks helpful:http://en.wikipedia.org/wiki/Stall_(flight)