Chevy Code Po449

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Code po449: i changed the vent solenoid,and erased the code and it...Po449 code evaporative emission system vent control circuit intermittent I have a 2008 chevy tahoe 5.3 liter four wheel drive. i have the[diagram] 2002 silverado evap diagram.

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Po449 code evaporative emission system vent control circuit intermittent

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I have a 2008 Chevy Tahoe 5.3 liter four wheel drive. I have the