Richard Jefferson scored 34 points and Bostjan Nachbar added 22 for the Nets.
Devin Harris, the point guard the Nets acquired in the trade that sent Jason Kidd to Dallas, sat on the bench because of a sprained left ankle. His absence was felt; New Jersey finished with 23 turnovers and 22 assists.
It was Indiana's first double-digit win since beating Atlanta on Jan. 4. New Jersey entered the game seventh in the Eastern Conference, with the Pacers three games behind.
New Jersey took a 63-58 lead early in the third quarter on a 3-pointer by Nachbar. Indiana responded with an 8-0 run, highlighted by a 3-pointer and three-point play by Danny Granger, to take a 66-63 lead.
New Jersey cut the lead to 68-67 before the Pacers went on a 12-1 run to take an 80-68 lead. The Nets missed five straight shots during that stretch helping the Pacers take an 85-72 lead the end of the third quarter.
Nachbar made the second of two free throws to cut Indiana's lead to 101-92 with just under five minutes to play, but Dunleavy made a 3-pointer at the other end to push the Pacers' lead to 12. Indiana led by at least nine points the rest of the way.
The Pacers struggled early, going more than eight minutes without a field goal in a stretch that lasted from late in the first quarter to just past the middle of the second quarter. New Jersey went on a 15-2 run during that span to take a 37-30 lead.
Indiana rallied, and a tip-in by Marquis Daniels with 1.3 seconds left in the second quarter gave the Pacers a 50-49 halftime lead.
This was the first of four meetings between the teams this season.
