BOZEMAN, Mont. (AP) _ Jeff Tuss rushed for two short touchdowns and Montana State's defense held in the late going as the Bobcats upset Idaho 16-13 on a cold, rainy Saturday.

Montana State (1-1 Big Sky, 4-2 overall) broke a 10-10 halftime tie on a 2-yard run by Tuss on its first series of the second half. A bad snap cost the Bobcats the extra point.

Idaho (0-2, 1-3), ranked 24th in Division I-AA, failed to score on its next four possessions.

Devlan Geddes sacked Idaho backup quarterback Eric Hisaw for a 7-yard loss on a third-down play late the fourth quarter, forcing Idaho to settle for a 32-yard field goal by Ryan Woolverton.

Idaho recovered its onsides kick, but lost the ball on downs with 1:40 remaining.

The Vandals scored on their first possession. Linebacker Dave Longoria's first carry of the season was a 1-yard touchdown run.

MSU answered with a 38-yard field goal by Geoff Groshelle.

Woolverton's 31-yard field goal put the Vandals up 10-3 at the end of the first quarter.

Tuss ran in from 1-yard out late in the second quarter to even the score at 10-10.