Andre Iguodala added 25 points and Elton Brand had 22 points and 14 rebounds as the Sixers avenged a loss to the Bulls two days ago in Philadelphia.
Derrick Rose led Chicago with 24 points and Ben Gordon added 18. Tyrus Thomas had 14 points and 13 boards.
Thomas' thunderous followup dunk tied at 90 with 17.6 seconds left in regulation.
The Sixers had the last shot, but after holding the ball and running down the clock, Iguodala drove the lane and fed in the corner to Miller, whose shot was short.
But in overtime Miller took over.