The drama for both title protagonists means Larne hold a three-point advantage heading into Monday's penultimate game of the season at Windsor Park.
At the Oval, league champions Larne took the lead in the ninth minute when Chris Gallagher won a tackle in midfield and played the ball to Andy Ryan in the right channel. The Scottish striker ran towards Paddy McLean before cutting inside and firing a low shot past Aaron McCully.
Both teams missed a chance to score when Shea McCartan's shot was blocked by Rohan Ferguson's legs, and the former Northern Ireland international was brilliant to convert the rebound.
Further on the other side, Mark Randall teed up Leroy Miller, his shot was saved by McCurry, and Joe Thomson was unable to force the rebound home.
Glentoran fortuitously equalized in the 57th minute when Cian Bolger miscued a clearance from Shea McCartan's cross, looping over Ferguson and into the net.
Larne almost regained the lead when Sean Graham cut inside with his left foot and his powerful drive was parried away by McCurry.
The visiting team also had a great chance in the 76th minute when Andy Ryan's header at the near post from a corner kick by Dylan Sloan looped in the air and Rahne hit the bar and the bottom of the post without anyone being able to convert. I made it.
Near the end of the game, deep into stoppage time, Cian Bolger played the ball into Glentoran's penalty area, and Glentoran defender Jonny Russell was forced to do his best to deflect the ball past his own keeper. There was an unbelievable development at the end.