Can some one help me with check engine light on.

http://www.automotiveforums.com/vbulletin/showthread.php?t=383727

I post it their this morning, but no one was answering me , please help me out thanks.

go get it scanned at Autozone for free.. it should tell you

I did that yesterday morning , the code is
Troubleshooting P0455

and the definiton is the pcm had determined that a large leak exists in the evaporative emission control system.

how do I fix that ?

Exhaust leak?