I had just gotten of the interstate and came to a stop light and the car started to shake its a** off. I gave it a lil gas a figured it was a hiccup. Not the case, its shaking its a** off ang generally running poor. I poped the old hood and the plate behind my crank pully is not atatched and is just spinning. What is this plate? Is this the problem? How can i fix it? It makes me wanna cry to go start it up 

gonna go pick a new one up, is this a hard install? it didnt look very hard