Ford edge 2007

I have the same problem with my ford edge a guy told me it was my torque converter flap or something but my car drives fine just the stuttering between 40-50mpg.Then I had another person tell me it’s the computer that he had the same problem and he changed his computer and it drove perfect for 4 months then started back doing the same thing. I’m lost if you have figured anything out please let me know and thank you