Slowmaro95Z28

Last night I was driving home and out of nowhere my serp belt came off. I figured it was just old and streched out so I drove home on battery power (no power steering sucks with 275/40ZR17's). I bought a new belt today and after putting it on my car wouldn't stay running. I took the belt back off and spun all my pullies to make sure none of them were seizing. They were all spinning free so I tried starting the car with the belt off and it was sputtering again but didn't stall. I'm completely lost. Any ideas?