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Sadly it sounds like a EVAP or issue that could be Related to cold weather starting. I would say the car is having a issue with knowing the right Temp so it can make adjustment by the computers. Could be an Injector issue related to cold starts....

I would take it to Chevy or a good Shop and have them track down the issue... Hard to say where to pinpoint this problem...

Sorry wasn't much help
James
 
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