Brian Vickers has had a recurrence of blood clots and will step out of his Michael Waltrip Racing ride this weekend at Auto Club Speedway. Brett Moffitt will return to the No. 55 Toyota as Vickers' replacement. The blood clots have been a persistent problem: Vickers missed the final five races of the 2013 season because he was placed on blood thinners to treat a clot in his right calf. More...