The top-seeded Pacers trailed by 17 points at halftime but fought back to win their third straight game and take a commanding lead in the best-of-seven series.
The Pacers can advance to a second consecutive East final with a win in Game Five set for Tuesday in Indiana.
After losing the series opener the Pacers have toughened up on defense to take control, holding the Wizards to a franchise-low 63 points in a Game Three win.
Paul ignited the offense on Sunday and team mate Roy Hibbert continued his resurgence with 17 points and nine rebounds.
Bradley Beal scored a team-high 20 for Washington.
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