Houston (8-5 last year) at No. 4 Oklahoma (12-2), Sunday at 6:30 p.m. CT (ABC). Line: Oklahoma by 23. Series record: Oklahoma leads 2-1. WHAT’S AT STAKE? Oklahoma saw its College Football Playoff hopes derailed in 2016 with a season-opening loss to Houston. The Sooners are well aware that a repeat would be damaging, especially because there isn’t a marquee opponent on the slate to give them a…