GLENDALE, Ariz. — Joshua Dobbs threw for a touchdown, James Conner and Rondale Moore ran for scores and the Arizona Cardinals stunned the mistake-prone Dallas Cowboys 28-16 on Sunday.

The Cardinals (1-2) never trailed and went ahead 21-10 on the final play of the first half when Matt Prater made a 62-yard field goal, a low liner that just cleared the uprights.

Arizona scored on all five of its possessions before the break.

The Cardinals, who also led at halftime in their first two games and coughed up a 21-point advantage against the New York Giants at home last week, held on this time.

Jonathan Gannon got his first win as Arizona’s coach as the franchise snapped a six-game home skid that lasted nearly a year.

Dobbs completed 17 of 21 passes for 189 yards and a touchdown.

Conner ran for 98 yards.

The Cowboys (2-1) — who were called for 13 penalties that set them back 107 yards — cut the margin to 21-16 with 9:33 left in the game thanks to a pair of field goals by Brandon Aubrey.

Dallas had three solid drives bog down inside the Arizona 10, including one that ended on a fourth-down stop when Dak Prescott threw an incomplete pass.

Prescott completed 25 of 40 passes for 249 yards, a touchdown and an interception.

Midway through the fourth, Dobbs hit Marquise Brown for a 2-yard touchdown, pushing the lead to 28-16 with 7:22 remaining.

Arizona sealed the win when Kyzir White picked off Prescott’s pass in the end zone with three minutes left.

Dallas looked like one of the best teams in the NFL through two weeks, drubbing the Giants 40-0 in Week 1 and beating the Jets 30-10 in Week 2.

But the Cowboys had a tough week at practice — losing star cornerback Trevon Diggs for the season with an ACL injury — and those bad vibes carried over into a gaffe-filled first half that included 10 penalties for 72 yards.

Meanwhile, Arizona was rolling from the opening drive. Dobbs ran for 44 yards on the second play of the game, rumbling down the left sideline before finally getting tracked down.

The Cardinals jumped to a 9-0 lead with 6:12 left in the first quarter after Conner ran for a 5-yard touchdown.

The Cardinals kept up the pressure in the second quarter with Moore — who is usually a receiver — taking a handoff and bursting through the middle of the line for a 45-yard touchdown run and a 15-3 lead.

The Cowboys responded with a 13-play, 75-yard drive that cut Arizona’s lead to 15-10. Rico Dowdle scored on a 15-yard pass from Prescott.