Mitchell Trubisky threw a go-ahead, 3-yard touchdown pass to David Montgomery with 2:17 left, lifting Chicago to a 24-20 win over the slumping Detroit Lions on Thursday.

The Bears took the lead on the nine-play, 90-yard drive in which Trubisky converted a pair of third downs with 35- and 32-yard passes Anthony Miller.

Chicago sealed the victory on the ensuing possession with Eddie Jackson's interception.

Rookie quarterback David Blough led Detroit's last drive to the Chicago 26 in the final minute before losing 13 yards on a sack to leave a desperation pass as the only option and Jackson picked off his heave.

The Bears (6-6) have won three of four games after losing four in a row, keeping their postseason hopes alive.

The Lions (3-8-1) have lost five straight for the first time under second-year coach Matt Patricia.

Detroit led for much of the game despite starting a quarterback it acquired from Cleveland for a swap of seventh-round picks after training camp.

Matthew Stafford was out for a fourth straight game with back and hip injuries and his backup, Jeff Driskel, was limited by a hamstring injury.

Blough, an undrafted player from Purdue, threw a 75-yard TD on his first completion to Kenny Golladay to pull the Lions into a 7-all tie. Blough threw an 8-yard TD pass to Marvin Jones late in the first quarter to put Detroit ahead 14-7.

Trubisky had an 18-yard TD pass to rookie tight end Jesper Horsted to make it 17-all late in the third quarter.

Trubisky finished 29 of 38 with three TDs, matching a season-high he also equaled in a win over Detroit earlier this month, for 338 yards and an interception. He got off to a strong start with a 10-yard pass to Allen Robinson and closed the game well enough for Chicago to score more than 20 points for the first time in more than a month.

Blough was 22 of 38 for 280 yards with two TDs and an interception.