Check to make sure all your vacuum hoses are in place under the hood. The evap solenoid is the little gray plastic can shaped piece on the passenger side near the firewall. Also check to make sure that none of the vacuum hoses are crimped. Finally, and most importantly, check to make sure your gas cap is tight, clicked down. They're the most common causes. I've not seen an Evap solenoid go bad to date.
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