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2015 gmc denali lml dmax. Truck was fully delted, 5 inch straight pipe, 66mm turbo, ppei tunes. All work was done in april this year and truck has ran fine until last week when temperature dropped below 50 degrees started running intermittent and loses power and has a bad vibration. But when it warms up above 50 degrees it runs fine again. Any tips?
 

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Sounds like your fuel has gelled. Try getting your truck into a heated garage and add a healthy dose of anti gel like Power Service or Lucas.
 

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Gelling at 50 degree's (F I assume :) ) seems unlikely. I assume this is outside temp and it run poorly until the outside temp gets up around 50?

Not an expert here - just trying to clarify.
 

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Not gelling at that temperature.
 

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Change fuel filter. Add anti gel. Buy good fuel. Check for air leak. Bad o ring could leak when cold.
 

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Gelling at 50 degree's (F I assume :) ) seems unlikely. I assume this is outside temp and it run poorly until the outside temp gets up around 50?

Not an expert here - just trying to clarify.
LOL, yes you're right. We have had some nut numbing temps around here lately and forgot about the rest of the country.
 
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