there are NO adjustments that should be made on these unless you are carb certified and have direct factory support, in most cases even with factory support they replace the component generally.

if the injector is malfunctioning replace it...
if it continues to leak internally replace the injector housing...
if the throttle body is malfunctioning try cleaning it, if that does not work repair the wiring if damaged, or replace the unit.

there is not much with these components that are servicable, they are meant to be replaced if faulty.
if further damage occurs to the engine it's all on you if you go into any of these sealed components trying to repair them.