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Q:

check engine light is on and sometimes flashing, running rough on 2004 Nissan Frontier

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the check engine light comes on and then sometimes the check engine light begins flashing. the engine is running rough.
(1) Answer
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/directory?address=77515&car_brand_names=Nissan