check engine light is on and sometimes flashing, running rough

This is a clear sign of a serious failure in the emission control system of your vehicle, take it ASAP to a qualified shop to diagnose and fix the problem and prevent further damage. For more information about the Check Engine Light visit: http://repairpal.com/check-engine-light Find a auto repair shop in your area here; http://repairpal.com/nissan-repair-in-angleton-texas