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cold start sputter
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  1. I4/I5 Engine & Drivetrain
    Ok I have a strange problem that has me stumped. I have a 2011 Chevy Colorado with 78,000 miles on it. This only happens when the truck sits for 6 to 8 hours. I start it up and it fires up right away no problem. It runs at 1000 rpms for 30 or 45 seconds. kind of the choke mode. it then drops to...
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