PITTSBURGH — The Dallas Stars had trouble controlling their emotions, giving up two power-play goals during an undisciplined first-period.

A late disallowed goal in the third allowed the Stars to channel their frustration into a come-from-behind win.

Tyler Seguin scored a power-play goal with 2.9 seconds remaining to give Dallas a 3-2 victory over the Pittsburgh Penguins on Thursday night.

“Crazy is a pretty good word,” Seguin said. “Desperation, compete by everybody. We really wanted that game.”

Seguin’s goal capped a furious comeback as Dallas scored twice in the final 2:57 to win its second straight and snap a six-game losing streak in Pittsburgh. Jamie Benn and Antoine Roussel also scored for the Stars, who wrapped up a three-game road trip with a win in Pittsburgh for the first time since Dec. 23, 2000.

Sidney Crosby had his fourth goal of the season and Chris Kunitz also scored — both on power plays in the first 10 minutes of the game — for the Penguins.

“We didn’t get a point out of that and it’s a little frustrating,” Crosby said.

Dallas, trailing 2-1, thought it had the tying score with 3:33 left, but Jason Spezza’s would-be goal was waved off after it was ruled that Seguin interfered with goalie Marc-Andre Fleury during a partial breakaway.

“Obviously a disallowed goal is a good bounce, but we didn’t take advantage of it,” Crosby said.

The Stars did, tying the game seconds later, as Benn got his second of the year when he slammed home a rebound from the top of the crease.

Seguin scored the game-winner after Crosby was whistled for tripping with 10 seconds left. He took a pass at the point from Spezza and wristed a shot that caromed off Fleury’s blocker and into the net.

Fleury finished with 25 saves, while Kari Lehtonen stopped 27 shots for Stars.

Penguins forward Pascal Dupuis left the game on a stretcher in the second period.

He was cross-checked in front of the net by Stars defenseman Alex Goligoski and hit in the neck or upper-back area by Kris Letang’s shot from the point while he was down.

Dupuis remained on his knees in discomfort and threw off his gloves, shaking his hands before play stopped with 6:58 remaining in the period. He was tended to while on his back for several minutes and gave a `thumbs-up’ to the crowd while leaving the ice.

“He had some numbness in his arm and it was coming back, so that’s a real positive sign, but I haven’t heard anything more,” Penguins’ coach Mike Johnston said.

Dupuis tore the anterior cruciate ligament in his right knee last December, costing him the final 43 games of the regular season. He had four points in the Penguins’ season opener last Thursday.

“As difficult as it is, you have to go out and play,” Crosby said. “I don’t think we necessarily let down because of that. They picked it up.”

Seguin, Benn and Spezza led the way.