Lidge entered in the ninth to protect a one-run. But Jody Gerut led off with a double and scored to tie it on Brian Giles' grounder to first base.
With two outs, Lidge walked Adrian Gonzalez and Chase Headley before Kouzmanoff took one out to left field.
Charlie Manuel removed Lidge to a standing ovation from the packed house at Citizens Bank Park.
Heath Bell earned his league-leading seventh save for the surprising Padres, off to a 9-3 start and tied for first in the NL West with the Dodgers. Cla Meredith (3-0) got the last two outs in the eighth for the victory.
Chase Utley, Ryan Howard and Raul Ibanez homered for the Phillies. Utley's solo shot off Duaner Sanchez leading off the eighth inning tied the game at 4.
Consecutive singles by Ibanez and Jayson Werth singled set up Feliz's fly into the right field corner that was tracked down by Giles.
Ibanez hit his team-leading fourth home run, a one-out shot in the second, but Gonzalez gave the Padres a 2-1 lead with a third-inning shot to straightaway center field.
Hours before the game, an estimated 9,000 fans - many who arrived well before sunrise, walked through Citizens Bank Park and said goodbye to Hall of Fame broadcaster Harry Kalas.
The Phillies also held an afternoon memorial service for the Kalas, who died Monday at age 73, while preparing in Washington for a Phillies-Nationals game.
Many mourners wept as they passed by Kalas' casket, located behind home plate, and celebrated Kalas' life during a 90-minute on-field tribute. The ceremony ended with a family friend singing the first verse to "High Hopes!" and a video of Kalas singing the second verse.
Notes: Phillies P Jamie Moyer was among a group who spoke at the memorial service for Kalas, held Saturday afternoon. Others included Mayor Michael Nutter, Governor Ed Rendell and Hall of Fame 3B Mike Schmidt. ... Phillies shortstop Jimmy Rollins and center fielder Shane Victorino received their Rawlings' Gold Gloves before the game. Closer Brad Lidge was also presented with the Rolaids Relief Man of the Year Award. ... Padres starter Walter Silva will be placed on the 15-day disabled list Sunday, retroactive to April 13. He will be replaced on the roster by right-hander Josh Geer, who is scheduled to start Sunday against the Phillies.
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