The Leathernecks (3-2, 1-1 Missouri Valley) trailed 10-3 at halftime but Kieron James blocked a punt to set Western Illinois up in Coyotes territory, and Lunt threw a 25-yard TD pass to Salomon to tie it. Lunt later hit Charles Chestnut for 39 yards to the South Dakota 1 and Caulton Ray ran it in on the next play to make it 17-10 WIU late in the third quarter.
South Dakota (1-4, 0-2) tied it up quickly. After Jasper Sanders returned the kickoff 55 yards, three plays later Josh Vander Maten found Anthony Williams for 41 yards and the tying score. But Lunt and Salomon answered for the winning points with 7:40 left.
Nikko Watson ran for 138 yards for the Leathernecks.
Joey Counts scored on a 1-yard run on fourth-and-goal with 2 seconds left to give Montana a 38-35 victory over four-time defending FCS champion North Dakota State on Saturday.
Transfer Vernon Adams will be the starting quarterback when Oregon begins its season against Eastern Washington on Sept. 5.
Tim Beckman is threatening legal action after Illinois fired him as football coach Friday amid allegations of influencing medical decisions and pressuring players to play hurt.
LSU offensive coordinator Cam Cameron revealed in a post-practice news conference that he has been treated for prostate cancer but plans to coach this season.
The woman who accused former Baylor defensive end Sam Ukwuachu of raping her in 2013 has hired a Title IX law firm to represent her in potential civil litigation.
Arkansas tight end C.J. O'Grady has been arrested by Fayetteville police and charged with driving while intoxicated and being a minor in possession of alcohol.