I just started my car up, and my best guess would be that it lost a spark plug (but what do i know). It idles real rough, it runs rough. I get so much vibration through the steering wheel. If i pop the hood, I also noticed slightly more engine movement at idle than normal. The exhaust sounds better than it did when it ran smooth, but something else is f'ed up. my SES light is now blinking. My SES light has been on for a while because my car keeps killing rear O2 sensors, but now the light is blinking.Ford said, about a month ago, that i needed a new Y-pipe($1200), i don't know if this is related or what. I also smelt a faint burning smell on the side of the car but could not identify it. What the hell just happened.