No, it's an Evap issue; related to the valve under the hood. Procedure to diagnose/repair starts Here. Easy check: apply 12V to the valve and see if it passes/blocks air when you blow through it.
Here's the fixed link. Nico changed some of their directory structure, and since it looks like a Linux server, capitalization matters
www.nicoclub.com/FSM/Xterra/2000/ec.pdf#page=1086