Does not work injectors in 2.8 cavalier engine

Who can support me I have a Cavalier Mod. 91 engine 2.8 lts. They do not activate the injectors, if there are ignition current and apparently there are pulses of land in injector harnesses when trying with LED focus, if I have gasoline pressure in the 40 PSI rail and if there is spark sparkfall, if I inject the starter through the acceleration body if the engine is maintained but once it ends up it is turned off.
Remove the injector rail and physically do not work, also the focus of Servise Engine Soon does not turn on the board.