Neftali Feliz left the game after three innings with right shoulder stiffness. Awaiting further evaluation.— Evan Grant (@Evan_P_Grant) March 20, 2012
As you can see, the Rangers and Feliz are awaiting further evaluation of Feliz' shoulder. It's not worth freaking out about yet, but it's definitely not a good sign, and not what the Rangers or Feliz want to see.
Grant noted that Feliz was able to throw up to 97 mph during his start on Tuesday, so it's not as if Feliz' velocity was missing.
From the sounds of it, it sounds like this was a precautionary move more than anything else, and there's certainly no reason to push Feliz if his shoulder is feeling achy in the spring.
We'll see what the Rangers staff has to say about the injury later on in the evening.