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    Noob questions/need a little bit of help

    Just got an 02 Yukon and have a few questions. 1. Got the following codes: PO420, B0434, P0442, what are they and how do I about fixing them? 2. What mods are recommended for reliability, performance, and mileage? Thanks, Corey 2007 Chevy Classic CCSB LS 4x4 w/ LBZ & 6 Spd Ally Greystone...

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