Devlin threw for 259 yards, including a 56-yard pass to Marvin McNutt on fourth-and-4 with 3:02 left for the winning score.
"A lot of games in this league are decided inside five minutes," coach Joe Philbin said. "It was nice to see our guys step up and make some plays."
Many of the players who took part will be out of work by Saturday, when teams must reach their 53-man roster limit. The fans knew it, which is why the stadium was two-thirds empty for the wrapup to the preseason.
Philbin said the Dolphins are better than a year ago, when they went 7-9 in his first season as an NFL head coach.
"We had an excellent training camp," he said. "We've covered a lot of ground and a ton of different situations."
By the start of the season, the final preseason game will be long forgotten. A neutral zone infraction by the New Orleans defense on the first play signaled the quality of what was to come.
"We did some good things, but we killed ourselves in a lot of ways," Ingram said. "We have to clean that up. We've got to take care of the ball."
Robinson said he didn't know whether he helped his chances of making the team.
"I'm just waiting to see what's going to happen, waiting and praying," he said. "I went out there and gave it all I had. It's a numbers game. You never know."
"Pat has an excellent mastery of the system," Philbin said. "He has very good poise, and he stepped up and made a play when we had to have one."
McNutt caught four passes for 99 yards. He's also battling for a spot on the roster.
"I don't know what they're thinking," McNutt said. "You just have to pray for the best."
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"It's really testing my patience," said. "It's a hill to climb. I'm climbing that hill."
Copyright 2013 by The Associated Press