PITTSBURGH — For more than 40 minutes, things came easily for the Indianapolis Colts. The defense overwhelmed Pittsburgh’s lifeless offense. Rookie running back Jonathan Taylor twice violently churned his way into the end zone. Philip Rivers found receivers running free all over Heinz Field.

And just like that, the momentum vanished. Indianapolis hopes its playoff chances didn’t disappear right along with it. Their stunning 28-24 loss to Pittsburgh left just about everything on the table for the Colts (10-5) heading into Week 17.

“When we had everything to play for, we just didn’t have all the answers in the second half of a game we had to have,” Indianapolis coach Frank Reich said. “I’m not doubting the coaches or the players. We had a bad game, a bad half and we weren’t able to finish it off. We’ve got to learn from it, get better next week and get some help.”

The result — the Colts’ seventh straight loss to Pittsburgh — seemed improbable for long stretches. Despite missing both starting tackles, Indianapolis spent the better part of the afternoon pushing the AFC North champions around. Taylor ran basically untouched from 6 yards in the first quarter to give the Colts an early lead. He shook off four defenders to do the same on a 1-yard plunge in the second.

Pittsburgh’s safeties crept closer to the line to help out and Rivers made them pay by delivering a beautiful 42-yard touchdown to Zach Pascal that put Indianapolis up 21-7 late in the first half. Rodrigo Blankenship’s 28-yard field goal early in the second half boosted the lead to 17. And when the defense turned the Steelers aside on four shots from inside the Colts 5, it appeared Indianapolis had things well in hand.