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Discussion Starter #1 (Edited)
My husband's truck is running really rough. He says it's "cutting out" and sometimes won't crank at all. It seems to come and go. The only code it shows is po 341 and no check engine light is on. Does anyone know what might be wrong with it.
(it also smokes a white blueish tint smoke during inital start it only does it when its missing)
 

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Probably sticking injectors from the ULSD. Put some additive in the fuel such as Stanadyne Performance Formula. It will lube the injectors and clean the fuel system. Also change the fuel filter.
 
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