ARLINGTON, Texas (AP) — So much for Andrew Luck and the AFC South champion Indianapolis Colts building some momentum for the playoffs. Tony Romo threw four touchdowns, one immediately after Dewey McDonald flubbed a perfectly thrown pass on a fake punt by the Colts, and Dallas clinched its first NFC East title in five seasons with a 42-7 victory. Indianapolis (10-5), held to a season low in points and yards for the second week in a row, has one game left to get back on track before going straight into the playoffs without a first-round bye. Things went awry in a hurry for Indianapolis, with Dallas opening the game with a 15-play touchdown drive that took nearly 8½ minutes and the Colts failing to get a first down on three rushing plays. After Romo surpassed Hall of Fame quarterback Troy Aikman as the Cowboys' career passing leader with a 25-yard TD to Jason Witten for a 35-0 lead with 4:41 left in the third quarter, Luck gave way to backup Matt Hasselbeck. The Colts, with only 1 yard rushing among their 229 total yards, finally scored on Hasselbeck's 1-yard TD pass to Zurlon Tipton after a pass interference call in the end zone wiped out a Dallas interception on a fourth-and-10 play. With a home playoff game already in hand, Indianapolis sat receiver T.Y.