A former Culver City couple found dead in their car west of Flagstaff, Ariz., died of carbon monoxide fumes from a faulty exhaust system, Coconino County sheriff's officers said. The bodies of Steven Serot, 40, and his wife, Vicki, 37, were found in their car along Interstate 40. Sheriff's Detective Mike Rice said the fumes entered the car through the trunk area. Rice speculated that Steven Serot felt sleepy and pulled off the road. The victims were moving to St. Paul, Minn., Rice said.