Cool 2008 Honda Accord Low Horsepower Check Engine Light Flashing References. I searched google and see this is surely a misfire. Other times, it might be the o2 sensor.

Replaced the battery and the starter about a month or two ago and had no problems until now. When it flashes at rough idle, it indicates problems with one of the gas caps, catalytic converter, oxygen sensor, mass airflow sensor, etc. Even if you try resetting the light, it will come back again so long as the problem still persists.