A crazed Co-op City janitor who fatally shot his ex-boss and wounded three other people was tackled by seven Bronx court cops after leaping from his chair yesterday as a judge sentenced him to 90 years in prison.

“Please let me go!” screamed Paulino Valenzuela, 48, who last month was convicted of second-degree murder in the 2007 attack that left Audley Bent, 59, dead.