I was driving my car home today and all my sensors started going off. I pull up on my block and all of a sudden my car starts to idle really rough, and has bad hesitation when I gas it. I pop my hood and find my alternator belt is snapped. So, I replaced that crank it back up and its still idles rough and has poor power. It idles at 500 rpm like a muscle car. I have few ideas like fuel, air and electrical, but I want some other opinions. Please anything would help.

 

Get that battery tested...