P0440 and P0441 codes

What is your question?

Van runs very choppy, hesitates and sounds like it wants to die. Codes came up... I replaced the purge valve and had already replaced egr valve. Most of what I've read about these codes says that there shouldn't be any noticable issues with how the van runs, but I'm having very noticeable issues. Any idea what I should do from here or what it all means? Thank you.

What makes this problem better or worse?

It's worse when it's sat awhile and then started up.

How long has your 2007 Chrysler Town & Country had this problem?

Almost 2 months