Charlotte Motor Speedway

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The field takes the green flag to start the NASCAR Nationwide series History 300 auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 24, 2014. (AP Photo/Terry Renna)

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Crew members perform a pit stop on driver Kyle Busch's car during the NASCAR Nationwide series History 300 auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 24, 2014. (AP Photo/Terry Renna)

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Ryan Sieg (39) spins out of control after driving through turn two during the NASCAR Nationwide series History 300 auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 24, 2014. (AP Photo/Chris Keane)

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Crew chief Chad Knause, left, talks with Jimmie Johnson, right, during practice for Sunday's NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 24, 2014. (AP Photo/Chris Keane)

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Kurt Busch waits in his car before practice for Sunday's NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 24, 2014. (AP Photo/Chris Keane)

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Kurt Busch climbs into his car before practice for Sunday's NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 24, 2014. (AP Photo/Chris Keane)

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Kurt Busch drives his car from the garage during practice for Sunday's NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 24, 2014. (AP Photo/Terry Renna)

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Dale Earnhardt Jr. looks over his car during practice for Sunday's NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Saturday, May 24, 2014. (AP Photo/Chris Keane)