Check engline light

[tmpj1524]

My 02 2.7 intrepid is having the same problem. Check engine light came on a few wks ago, and I have had probs with the gas cap this whole time. p0456 and 0441 are now showing up. Could the gas cap be causing the ecs problem? 126k miles, starts fine, kinda jerks very little when warming up, not all the time, just a little miss here and there. Any ideas?