CHICAGO—The Minnesota Vikings have little margin for error and plenty of room to improve as they try to secure a playoff spot. Not that Kirk Cousins needed a reminder. Or, for that matter, coach Mike Zimmer. Cousins threw two touchdown passes, and Minnesota beat the struggling and short-handed Chicago Bears 17-9 on Monday night. The Vikings (7-7), part of a tight pack of teams vying for one of the NFC’s seven playoff spots, were in line for their most lopsided win before Justin Fields threw a touchdown pass to Jesper Horsted on the game’s final play. That score aside, Minnesota withstood several scoring threats by Chicago down the stretch coming off a win over Pittsburgh in which the Vikings nearly blew a 29-0 lead. “I think we have work,” Cousins said. “I think there is a lot to improve upon. We’re playing three really good opponents up ahead. We’re probably …