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around 20degress the truck will start and die rite away time&time agine until it gets alittle warmer then starts fine.

Vehicle: GMC,2004 Canyon,3.5,5 Cylinder

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P0601 Internal microprocessor control module read only memory (ROM)

P0601 will go unnotice there will be no drivabilty problem , and it will not cause the vehicle to stall out right away, Do a throttle body and a MAF (mass air flow ) cleaning, The reason the MAF can get contaminated and over report a condition and lean out the vehicle condition, A throttle body cleaning helps restore the idle condition. Try this ismay help for cold start condition

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