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  1. 01-04.5 LB7 Duramax Powertrain
    I have an 03. I live in Ca. and I have to smog my truck this month, and it won't pass because I have a cel on I have cleared the codes, and replaced parts for the codes but light keeps coming back on any sugestions the codes are P0101, AND P0404. I have replace the MAF sensor, a new EGR valve. I...
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