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2017 Silverado misfire and throwing codes


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Hi I have a 2017 Chevy Silverado 5.3 with minor mods. Trucks currently on intake/ headers and tuned on E85. I recently swapped out my heads for some ported heads. And truck started misfiring and it threw 2 codes U1510 and P16a1. Truck idles really ruff and motor shakes more then usual. Any idea what it can be ? 

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