2001 Jeep Cherokee, 37k 4WD

I keep getting the check engine light coming on after resetting and driving for about 2 or 3 days. Bought this jeep new, and wife drives it (not very far). The gas cap has been changed and I replaced the rear CCV hose to the manifold. I get codes P0442 and P0455. I do not smell gas under the hood? Wife says that jeep seems to burn more gas, and runs rough. Any thoughts?

Thanks for your assistance.