PLAY AT ST. LOUIS NEXT Stars Shock Ki mas Dy DWAYNE NETLAND Minneapolis Tribune Staff Writer LOS ANGELES, Calif. The Minnesota North Stars erupted for five straight goals in the second period Thursday night to bomb the Los Angeles Kings in the seventh and deciding game of the best-of-seven semifinal Stanley Cup series. The score was: North Stars 9, Los Angeles 4. The North Stars, who had lost all three previous games at the Forum in the series, will now face the St. Louis Blues in the first game of the West Division final best-of- seven playoff Sunday in St. Louis. The North Stars got off to a fast start, dominating action for long stretches in the first period, outshooting the Kings 14-4 over that stretch and taking a 3-1 lead. Terry Sawchuk, who got the deciding game nomination from coach Red Kelly to replace Wayne Rutledge in the Los Angeles nets, looked a bit shaky on two of the Minnesota goals. Parker MacDonald beat him from 15 feet at 2:24, after coming out of a scramble with the puck and shoot ing unmolested from a left angle. Los Angeles tied it up only 27 seconds later. Howie Menard took the faceoff near the Minnesota net and Doug Robinson caromed his relay past a surprised Cesare Mani-ago at 2:51. The North Stars converted a power play, only their third of the series, at 8:05. With Eddie Joyal in the penalty box for a hooking violation, Wayne Connelly had plenty of time to ride in on Sawchuk. Connelly wound up leisurely and rapped it in from 25 feet. By now the Forum patrons were beginning to stir uneasily, and their concern turned to boos when Bill Goldsworthy made it 3-1 at 16:25. Goldsworthy spun a backhand shot in past Sawchuk, who was to have one of his most ineffective games in 100 games of distinguished Stanley Cup competition. In the second period the North Stars tormented Sawchuk with five goals, their largest output of any session this season, to take an 8-3 lead as the boos came cascading down from the Forum rafters. Actually it was Eddie