When your cel flashes like that, it means that your catalytic converter is about to melt down. That is the highest priority code your computer can throw. The shuddering and shaking is obviously a misfire, most, if not all of the fuel is not being burnt and then sent to the converter to try to...
Make sure to inspect the plug in the rear of the alternator. My battery light came on a couple months ago, I inspected the alternator and found the power wire completely corroded and one of the terminals on the back of the alt corroded off and stuck in the plug. I have a parts truck and it was...