mmy 2001 pathfinder runs rough in cold weather.engine light blinks

If you have no engine codes being shown you can try to remove the mass airflow sensor and clean it with either mass airflow cleaner or electronic parts cleaner. When the MAS gets dirty it disrupts proper air fuel mix and is a pain to recognize as the problem because you don't always get an engine code for awhile. So clean the 2 wires with the spray completely but gently. Then reinstall and see what happens. Also, when check engine light blinks like this, it could be that another coil is going bad and get it read to find out which one.