BOISE, Idaho (AP) _ Boise State's defense forced five Montana turnovers and stopped Grizzly running back Marc Monestime at the Bronco 40-yard line on the final play of the game to post a 27-21 Big Sky Conference win Saturday night.

Led by backup quarterback Bert Wilberger, who came off the bench in the first quarter after starting quarterback Brad Lebo suffered a shoulder injury, Montana drove deep into BSU territory in the game's closing seconds, only to come up short as time expired.

Montana, 0-2 in the Big Sky and 1-4 overall, drove to the Boise State 2- yard line with 22 seconds left on a 23-yard pass from Wilberger to Bill Cockhill. But with no time outs remaining, the Grizzlies were unable to score what would have been the winning touchdown and extra point. After an intentional incomplete pass to stop the clock, Wilberger threw a pass to Monestime, who was hit for a 2-yard loss with seven seconds remaining.

Montana, however, was unable to get off another play.