Cjanssen97

Hey, so I started my 1995 5.8 v8 today and noticed it was idling really high and then would die when I put it in gear. The check engine light came on then went of and did this for awhile. I let it idle for awhile and everything seem normal. I drove off and noticed it was extremely hard to brake and the truck seemed to propel itself really fast when I let off the brake. I got home and popped the hood to notice the ac/idle pully was not spinning. I shut it off and it started spinning then again it stopped and started so on and so on. It does not sound to good either. Any ideas what it is and how to fix it?