It's about a boy who is in the foster care system and he runs like all the time?

Maniac Magee by Jerry Spinelli:

Maniac Magee is a folk story about a boy, a very excitable boy. One that can outrun dogs, hit a home run off the best pitcher in the neighborhood, tie a knot no one can undo. "Kid's gotta be a maniac," is what the folks in Two Mills say. It's also the story of how this boy, Jeffrey Lionel "Maniac" Magee, confronts racism in a small town, tries to find a home where there is none and attempts to soothe tensions between rival factions on the tough side of town. Presented as a folk tale, it's the stuff of storytelling. "The history of a kid," says Jerry Spinelli, "is one part fact, two parts legend, and three parts snowball." And for this kid, four parts of fun.

http://www.amazon.com/Maniac-Magee-Jerry-Spinelli/dp/0316809063/ref=sr_1_1?ie=UTF8&s=books&qid=1256673197&sr=1-1

Thank you!