The NFL's most electric runner writhed in pain and seemed to be favoring his back. The injury was announced as bruised ribs, and coach Jim Mora appeared confident that his quarterback would be ready for Sunday's game at Chicago.
"Mike doesn't miss games," Mora said. "He'll do whatever it takes to get ready to go."
Vick was the difference as the Falcons bounced back after losing three of four games to fall behind in the NFC playoff picture.
A vicious late hit from linebacker Ronald McKinnon, who drew a roughing-the-passer penalty, knocked Vick to the turf and he was slow to get up. Vick stayed in for two more plays, but the pain was too much -- he called a timeout with 9:21 left, slowly walked off the field and was escorted to the locker room.
"I landed with a guy's foot right on my ribs," Vick said. "Then I aggravated it when I took one more hit."
Added Vick: "Hopefully I'll be able to play this Sunday. ... I'm confident. I'm always confident. I've just got to get my treatment."
The Falcons (8-5) still are behind in the playoff race. They would lose NFC tiebreakers with two other 8-5 teams, Dallas and Minnesota. Atlanta has games remaining against Chicago, Tampa Bay and Carolina -- all playoff-caliber teams.
"Well, we're in a fight, we're in a dogfight," Mora said. "We'll take it. It's better to be in a fight than not be."
Vick was 12 of 23 for 231 yards with a touchdown and an interception and rushed for 38 yards in his fourth career game with two scores on the ground. Alge Crumpler caught three passes for 94 yards.
New Orleans' Aaron Brooks passed for 219 yards and a touchdown and Antowain Smith rushed for 60 yards and a touchdown on 11 carries.
Hall pulled the ball loose before Horn hit the ground and returned it 20 yards to the Saints 12, setting up a 1-yard touchdown run by T.J. Duckett.
Hall had interceptions in each of Atlanta's first two Monday night games this season. He had another apparent interception return for a touchdown wiped out by a roughing-the-passer penalty against linebacker Demorrio Williams late in the first half.
Vick gave the lead back to Atlanta with his 2-yard dive for the pylon, capping a drive that included a 36-yard pass to Brian Finneran.
On third-and-goal from the 2, Vick scrambled to his left and appeared to be pushed out of bounds near the 1. The officials spotted the ball at the 1, but Mora called for the review.
"Because Mike Vick told me to," Mora said. "He said 'Challenge it, we'll win it.' You listen to what No. 7 says."
The run was ruled a touchdown after replays showed Vick kept his leg in bounds as his body flew over the pylon, the ball in his hands.
"It is hard to defend the quarterback," said Saints coach Jim Haslett. "He does a great job. He made a nice play. I guess his hand touched the pylon. I thought the ball was outside the pylon, but if any part of your body touches the pylon it is a touchdown."
Vick went to the air -- with a little trickery from Mora's playbook -- for the Falcons' next touchdown.
Late in the second quarter, Vick lined up as a wideout as Warrick Dunn took the snap and then pitched the ball to the quarterback. Vick, under pressure from defensive end Tony Bryant, waited for White to get open and then heaved the ball downfield.
Vick took a big hit from Bryant, but White caught the ball between defensive backs Dwight Smith and Josh Bullocks and then outran Fakhir Brown to the end zone for the 54-yard TD.
Vick and the Falcons stretched the lead in the third quarter with another quick-strike touchdown. On first down from the 17, Vick faked a handoff to Dunn to his left and then took off on a run to the right, fooling most of the Saints. Vick high-stepped over the pylon, and this time no review was needed for the touchdown call and a 28-17 lead.
Atlanta's defense contributed a safety with 40 seconds left in the third quarter, pushing the lead to 30-17. One play after rookie Darrell Shropshire sacked Brooks at the 4 for a loss of 6 yards, Antwan Lake dropped Brooks in the end zone for the safety.
After Vick left the game, Peterson kicked a 43-yard field goal.