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bad gas mileage
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  1. Engines/Performance/Tech Questions
    Hello 355 Nation! Been using this forum for months now as I've just picked up a 2009 Colorado. Thank you for all your information!!!! The truck has 84000kms. Yes you read correctly kms. 4x4 i5 3.7 Z71 Crew Cab. Dark Grey. 265 70 17 k02 - tire pressure is perfect on all 4. 2" torsion bar lift...
  2. 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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