Manning began the comeback when he hit Demaryius Thomas on a 29-yard touchdown pass on the opening drive of the second half.
Manning’s 21-yard touchdown pass to Brandon Stokley gave Denver its first lead of the game, 28-24 with 9:03 left. Stokley outleaped defensive back Marcus Gilchrist to catch the ball, and then got both feet down before tumbling out of the end zone.
That score was set up by Carter’s interception.
Harris sealed the victory with a 46-yard interception return for a touchdown with 2:05 left. It was his second pick of the game.
“This was as good a second half of football as I’ve been involved in,” Broncos coach John Fox said.
As for Manning, “He’s real high on my list,” the coach said. “He performed very well and has performed well in the last four games. He’s going to keep getting better and better.”
Manning finished 24 of 30 for 309 yards with one interception.
“Regular-season game, I think this is the best,” said Stokley, who was a teammate of Manning’s with the Colts. “The second half was unbelievable. We needed to win big-time and to perform like he did, it was awesome.”
Fox said there “were no mystery words of wisdom at halftime. “Given how poorly we played in the first half, we just said we could play better in the second half and we broke out of it.”
“We came out in the second half, everybody was accountable and professional,” he said. “We had 30 minutes and I thought it was important to get off to a good start with that first drive. Hitting DT for the touchdown really set the tempo for the second half.”
Both teams head into their bye week.
“We feel fortunate to be tied for first place in our division at 3-3,” Manning said. “It’s going to be a competitive division down the stretch. There are some things we can improve on and we’ll use the bye week to do that.”