Manziel rushed for a 5-yard touchdown three plays later.
Oklahoma (10-3) trailed 14-13 at halftime, but couldn’t muster any offensive production in the second half to keep up with Manziel and the Aggies, who scored touchdowns on each of their first three second-half possessions to open a 34-13 lead.
The Aggies, founding members of the Big 12 Conference in 1996, bolted for the Southeastern Conference, where they were expected to struggle in their first season; the SEC has produced major college football’s last six national champions.
But under Kevin Sumlin — a Stoops assistant at Oklahoma from 2003-2007 — Texas A&M took its new league by surprise in 2012, including an upset victory at defending national champion Alabama.
Since Stoops’ first season at Oklahoma, his teams have typically dominated Texas A&M. His two previous losses to the Aggies came in 2002 and 2010, both at the hostile Kyle Field. Last season in Norman, the Sooners easily handled Texas A&M 41-25.
“To come in and go against a Big 12 rival and do everything we wanted as a team, and send these seniors out with a win, we couldn’t feel any better,” Manziel said.