car wont start on 2004 Pontiac Grand Am

my pontiac dies 2 weeks ago. i just replaced the battery because it was completely dead. now the battery cranks but wont fully start the car. the gas was almost empty so i put almost half a tank in manually and it still wont start. any suggestions

Asked by for the 2004 Pontiac Grand Am
Check for spark at the plugs and fuel pressure at the engine. Check that the injectors are opening properly.