My car does this whenever I roll down my parking garage. I'll roll down in neutral and it'll start to rise when I start to put it in second gear. Does it almost every morning. I also have a Lund tune, but I've always figured it was something like you said, where it's to help with the shock of...
Yeah I remember that stock air filter box was a pain. It's most likely something with the MAF. If you don't find anything wrong when you check it again I would take it to the dealer.
I would definitely go back to stock tune as Obsol3te said and see if runs normal. It's a long shot but i would also make sure your air filter is fine, and that everything with your MAF tube is fine (cracks, loose connections, etc.).
My car was sputtering and I had codes that my car was running...
Does anyone actually have a picture of the RTR Tech Mesh wheels on a mustang? I like the look of them but you never know until you see them on the car.
I just had this issue. It's your fuel pumps. 13k miles on mine when they went out. The car would sputter when I tried to give it gas, and that eventually turned into it not starting up at all. Warranty will cover the issue.