I was driving around today, nothing out of the ordinary or rough. I was behind a car making a turn. After he had made his turn, I have it some gas. As I did this, it began to run poorly and loudly. I backed off the throttle and babied it to my destination. I checked my fluids, any loose cables. None that I could see. I notice my check engine light is flashing at me. I turn it off and let it cool for about 2 hours. I baby it back home with the same conditions. With it running, I see exhaust coming out near the manifold, where it connects to the block. Any starting points to check? Thanks.