Why does 04 outlander lug and surge while driving? SEL came on 2days ago.

What is your question?

This problem started last summer but subsidied when cooler weather came. This summer it has gotten progressively worse and now Service Engine Soon light is on. It has no issue starting, and does not idle poorly, or erratically. It doesn't seem matter what speed i am going. I did discover if i use cruise control , the issue no longer exist