"We're all angry and disappointed," Roethlisberger said, Brady "is good, so you know that your mistakes have to be limited."
After Gronkowski's touchdown, Pittsburgh's Shaun Suisham and Gostkowski traded field goals before Roethlisberger hit Antonio Brown for a 27-yard touchdown. It was the 200th touchdown pass of Roethlisberger's career, second in Steelers history to Terry Bradshaw's 212.
The Patriots got the ball back with 1:50 left in the half and went 77 yards on nine plays to a 1-yard scoring run by Ridley.
After Cotchery tied it at 24, the Patriots took the lead for good on Gostkowski's 32-yard field goal.
"When (Gronkowski's) healthy and on the field, he's tough to stop," Brady said, "It's been a process for us, but at the bye week, 7-2 is not bad and, hopefully, our best football's ahead of us."
NOTES: The Patriots scored at least 50 points for the sixth time with Brady as their starting quarterback. ... New England has 36 straight games with at least one takeaway, the current longest streak in the NFL. ... The Steelers fell to 2-6 for the first time since 2006, the season after they won the Super Bowl.