PHILADELPHIA — The Eagles’ offense found some rhythm Monday night — then kept tripping over it. Promising drives were derailed by penalties, turnovers and stalled finishes, turning flashes of production into frustration in an overtime loss to the Chargers.

That’s the tightrope the Eagles are walking during this short week as they aim to snap their three-game spiral when the lowly Raiders (2-11) come to Lincoln Financial Field Sunday.

The Birds (8-5) have an offense that can occasionally move the ball and look functional for quarters at a time, then commits self-sabotage in a blink. Offensive coordinator Kevin Patullo, who has been under a microscope all season, didn’t sugarcoat what it feels like when good drives don’t end in six.

“It’s really frustrating because obviously red zone-wise

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