car misfires motor shakes

Question

car runs very rough motor shakes engine light blinks on and off sometimes it on steady code p0300 on code reader

Answer 1

The flashing light indicates there could be converter damage happening. I would start with a tune up. The multiple misfire code can be caused by bad plugs, or wires, or the coil. Start with plug replacement and go from there. The fact that the light is flashing indicates a failure in the ignition system.