I've got the tiniest little wiggle in the driver seat of my car. It just started. The area that is loose is a yellow plastic grommet that is part of the arm controlling the seat height. The bolt and nut are tight, but there is still play because of space between the bolt and this grommet. I don't have a solution for this problem yet, but I will update this post when I do. In the meantime, check this area if your Ford has a loose seat and try to think of solutions to keep the seat from jiggling.