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bad gas mileage
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  1. I4/I5 Engine & Drivetrain
    I need help. My truck is running awful. It is a 2006 Colorado with I5 3.5L with 36,000 miles. It has the check engine codes of P0014 and P0300. It's symptoms are loss of power, bad gas mileage, rough idle and when I'm driving at highway speeds the truck has very slight power surges and is...
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