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poor mileage
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  1. 04.5-05 LLY Duramax Powertrain
    2005 Chevy 2500HD LLY Duramax 140,000 miles Edge Juice /Attitude, 5" Magnaflow, SB Air Intake My truck has been running rough and only about 12mpg my mechanic replace the EGR Valve, It ran great for a day then returned to running like crap,and its giving Engine codes 401 & 404, now he is...
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