Just dropped $1200 on a custom tune from a shop in Dallas and my truck feels slower now
They promised big gains for my 2016 5.0, but after the flash, the throttle feels lazy and it hesitates pulling onto the highway. I've got all the paperwork saying 93 octane and a CAI, but it just doesn't pull like it did stock. Has anyone else had a tune actually hurt performance, and did you get your money back?