I have a 1982 Monte Carlo 2 door coupe. Its in fantastic condition for a 23 yr old vehicle. Ive been driving it for 2 months and yesterday, I began to hear a rattling sound from under the hood. I popped the hood while the engine was still running to get a better look. It seems to be coming from the point where the engine fan connects to the area which holds the wheels and belts. That area is rocking slightly up and down. Any ideas??