You can get a small screwdriver in between the white plastic and black on the other side of the clamp and it'll pull right off easily. Ford loves these connectors for low pressure stuff because they are click-on for assembly line workers. Don't force it. If it's opened enough it'll slide right off.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto tune, 100 shot on BBR tune, best et: 11.38 at 120.85
2012 GT, Candy Red, Brembo, 3.73, Tech, Comfort, etc. Procal tune, Roush upper, UMI LCAs, Steeda red bracket, GT500s, 28X10X16 Hoosier slicks, best et: 11.91 at 115.23 RIP