SANTA CLARA — A week before meeting the 49ers, the Houston Texans owned a 20-3 halftime lead Sunday on the 49ers’ arch rivals, the Seattle Seahawks.

“We’re going to get right back in that same spot and finish the job,” quarterback Matt Schaub said Monday on his weekly radio show regarding the Texans’ intentions for their Candlestick Park visit.

Schaub and the Texans are reeling after not finishing off the Seahawks, who rallied for a 23-20 overtime victory in Houston.

The 49ers and Texans each might have 2-2 records and still-existent Super Bowl expectations, but they’re coming off drastically different ballgames. The 49ers have been bathing in good vibes after their 35-11 win Thursday night at St. Louis.

The Texans must stew for a week after their second-half collapse against the unbeaten Seahawks.

For the third straight game, Schaub has had a pass intercepted and returned for a touchdown. Richard Sherman’s 58-yard interception return tied Sunday’s score at 20 with 2:40 left in regulation.

“We had ’em on the ropes,” Schaub told SportsRadio 610. “Our team played outstanding. One play every game can be the difference between winning and losing. Unfortunately, we were on the wrong side of that.”

The Texans collapse came without linebacker Brian Cushing, who exited because of a concussion. Cushing will have to pass a series of post-concussion tests this week to play against the 49ers.

Coach Gary Kubiak said Cushing attended Monday meetings and was feeling better. As for Schaub’s state of mind, Kubiak said he had a long talk with his quarterback after Sunday’s game and continues to endorse the Texans’ starter since 2007.

“I don’t see a lack of confidence. I see some poor decision-making situations,” Kubiak said at his Monday news conference. “(There’s) some that he has to handle, and some we can help him handle.

“When you battle that hard and your team battles that hard to win a game, and something like that happens, emotions of the moment are extremely difficult,” Kubiak added. ” … We’re there for him right now. We have to help him work through this.”

Schaub has thrown an interception in seven straight games, including last season’s two playoff games before the Patriots dispatched Houston in the divisional round.

Of Sherman’s interception, Schaub said: “To just give them that, it’s a crushing blow. It hurt. It hurt bad.”

The 49ers defense has produced just three interceptions all season, including one against Sam Bradford on Thursday night while dropping at least two other potential interceptions.

The 49ers and Texans have met only twice previously in regular-season action: The host 49ers won 20-17 in overtime in 2005, the host Texans prevailed 24-21 in 2009.

Schaub was the Texans’ quarterback in that 2009 win, going 20 of 30 for 264 yards with two touchdowns and no interceptions as the 49ers rallied behind Alex Smith off the bench.

Schaub’s take on this year’s 49ers: “They’re a good defense. Very big up front, very physical, a good secondary, much like we faced yesterday. We’re going to have to play our best ball, our most complete game, to find a way to get a road win.”

For more on the 49ers, see Cam Inman’s Hot Read blog at blogs.mercurynews.com/49ers. Follow him on Twitter at twitter.com/CamInman.