Saraboukert

I have a problem with my maxima ( 2009) if anyone can help me. So the problem start with loss of power i was driving at 60 and it was like if i was driving at 40. After 1 day she stops starting, so i chek the spark plug and there very black. But i think there is a problem with the gaz pump or injector because theres no gaz coming! If anyone can help asapp plz!!!