DAYTONA BEACH, Fla. -- NASCAR has announced that rule infractions this past weekend at Las Vegas Motor Speedway have resulted in the suspension of three Nextel Cup Series crew chiefs. The No. 48 Chevrolet team received three penalties, due to the car's roof height being too low in post-race inspection... (snip) A penalty of 25 driver points dropped Jimmie Johnson -- the race winner at Las Vegas -- back to second place in the standings, 10 behind reigning series champion Kurt Busch. Chad Knaus, Johnson's crew chief, has been suspended from competition for the next two races and fined $35,000;...