Could be vapor recovery canister. There is a flat rectangular tank under the trunk that stores vapors from the fuel tank. It vents those vapors to your intake manifold under certain conditions to make room for more vapors. Valve could be stuck or something. Could place to look first anyway.
"My Name is Richard. I am a Contouraholic."
1999 SE Sport Duratec ATX Spruce Green; Drop--In K&N Filter; VentShades;
Fog Lamp Fix Mod & PIAA510s with Bumper Braces & Stock Type aiming screw mod;
PIAA 9006 Super White Headlamps
AIWA CDC-MP3 HU; WeatherTech Mats
Viper 600ESP w/Remote entry
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