PHILADELPHIA -- Andre Iguodala squared up for a 3-pointer from the wing like he had hundreds of times in his career.

This shot was different from all the others.

Iguodala continued a postseason where his final numbers don't pop on the box score, but the buckets are as pivotal as they get. He snapped a tie game with five straight points in the final 90 seconds to help the Philadelphia 76ers storm back from 18 points down in the third quarter and stun the Boston Celtics 92-83 on Friday night in Game 4 of the Eastern Conference semifinals.

The young Sixers were a team reborn in the second half and played like a squad that refused to roll over for the championship-tested Celtics.

"I don't even know where to start," Philadelphia coach Doug Collins said. "Our guys are pretty amazing. They really are."

Iguodala certainly has been.

One of the more maligned athletes in recent Philadelphia history, he's changing his reputation one fourth-quarter point at a time.

Iguodala put the Sixers ahead 85-83 with a step-back jumper over a flailing Ray Allen with 1:22 left. Then he took the feed from a driving Williams and buried a 3-pointer for a five-point lead.

Game over.

"That's not the first time he found me in that same exact spot," Iguodala said. "Just not as big a platform as it was tonight. But it worked out for us."

With the huge comeback, the Sixers tied the series at 2-2 and guaranteed a return home for one more game.

Game 5 is Monday in Boston.

They can thank Iguodala, Lou Williams, Evan Turner and Lavoy Allen for an unforgettable second half that left the Celtics purely dazed following an outcome that hardly seemed possible when Boston led 14-0 to start the game.

Iguodala and Turner scored 16 points. Williams scored 13 of his 15 points in the second half. Allen grabbed 10 rebounds.

Kevin Garnett had his first miserable outing -- finishing with nine points -- in an otherwise monster series. With Garnett in a funk, so were the Celtics.

Garnett, who turns 36 on Saturday, missed nine of 12 shots. He had little help from an offense that sputtered after the sizzling start. Paul Pierce scored 24 points and Rajon Rondo had 15 points and 15 assists.

"We had a team down and we didn't finish them off," Garnett said. "It's pretty disappointing. So, we have to go back home. They did what they needed to do to protect their home court, now we have to go do the same thing."

The Sixers just kept attacking, turning a first half of airballs, botched dunks and sloppy defense into a full-blown display of near-flawless basketball.

Thaddeus Young's thunderous slam tied the game at 63 in the middle of the fourth. And when Jodie Meeks drained a 3-pointer on the Sixers' next trip down the court for Philadelphia's first lead a packed crowd of 20,411 fans stomped their feet and unleashed two hours of pent-up jubilation.