Chevrolet Luv 2000 Failure

Greetings, I have a 2000 luv year has a failure in cylinder #2 which is not working changed spark plugs, cables, coil, position sensor, gasoline pump, even lower the camera where I checked that the valves of that cylinder were not fully closing, for more explanation the intake valve only closed half Car did not turn on, I put a little oil to each cylinder and could turn on but with a lot