Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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If the check engine light is flashing that is a sign of a multi cylinder miss fire. Which if it happened out of the blue is normally a distributor issue. The distributor has the cam sensor built into it and if that sensor fails you can get P300, P1320 or P340 codes.
I would have the truck scanned to see what codes you have. Also keep in mind, when the check engine light is flashing you can do engine damage.
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You can try, but if it is a distributor issue, they won't help.