A troubled student dressed in combat gear opened fire indiscriminately at the University of Oregon's football stadium today, killing a former Olympic sprinter and wounding a college wrestler, and then apparently committed suicide, officials said.

The body of the student, identified as Michael Evan Feher, 19 years old, who was described as unable to deal ''with the slightest pressure,'' was found inside Autzen Stadium by a police team about noon, some three and a half hours after the shooting began.

''It appears at this time he took his own life,'' Police Sgt. Tim McCarthy said.

The sniper, his face blackened and equipped with a high-powered rifle and shotgun, appeared ''ready to go to war'' as he roamed through the athletic complex, Sergeant McCarthy said. Mr. Feher, a native of Everett, Wash., had been enrolled through the summer term at the university as a psychology major and was in the process of re-enrolling for his sophomore year, according to Dick Hill, university Provost. He was living at a local fraternity, Delta Tau Delta, in Eugene, Mr. Hill said. There was no indication why Mr. Feher opened fire, Mr. Hill said. A fraternity house resident who declined to give his name said Mr. Feher ''did not go out to kill anybody.'' Describing the shootings as ''incidental,'' the resident said, ''It was a suicide, pure and simple.'' Asked how he knew Mr. Feher intended only to kill himself, the resident replied, ''Because I knew Michael.''

The slain victim was identified as Christopher Brathwaite, 35, of Eugene, a former student at the university who was a Trinidad native and a member of Trinidad's 1976 and 1980 Olympic track teams, school officials said. Mr. Brathwaite also competed for the University of Oregon track team.