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getting codes p0172;p0175 on a 09 silverado on 2009 Chevrolet Silverado 1500

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Im getting two codes p0172-p0175 on a 09 silverado ext cab eng. code 0. any ideas
(1) Answer
Possible restricted air filter, maf sensor or circuit, fuel pressure regulator, injectors etc... Needs to be checked with a REAL scanner.