The Sixers were a team reborn in the second half and played like a squad that refused to roll over for the championship-tested Celtics. They tied the series at 2-2 and guaranteed a return home for one more game.
Iguodala, one of the more maligned athletes in recent Philadelphia history, put the Sixers ahead 85-83 and buried a 3-pointer for a five-point lead.
Game 5 is Monday in Boston.
Iguodala scored 16 points, Evan Turner had 16 and Lou Williams added 15.
Kevin Garnett had his first bad outing in an otherwise monster series with nine points. With Garnett in a funk, so were the Celtics.
