BROOKLYN, Mich. — Greg Biffle won the NASCAR Sprint Cup race at Michigan International Speedway on Sunday when leader Jimmie Johnson left the track because of engine trouble with six laps left. Johnson started the race from the back because of an engine change, but made it all the way to the lead and looked as though he had the superior car after passing Brad Keselowski on lap 191 of 200. But Johnson couldn't hold on, and Biffle took advantage.