Code 64 popped up... Fuel pump or Fuel injectors

I have already posted a few questions due to this problem and i am close too figuring out what it is but its between to things now fuel pump or fuel injectors(according to code 64 diagnostic). Basically my car isn't running as strong, kinda sputtering during acceleration, running rough... gas mileage is very poor. I had a diagnostic on it a few days ago and code 64 popped up saying left bank running lean intermminent cose set?... and the guy mentioned its probly either injectors or fuel pump, but to me i dont see how a fuel pump could cause the problem im having but i may be wrong. Also if anyone has a link for running codes on camaros(94 Z28)? So what do u guys think fuel pump or injectors?


Thanks Again

Also if the problem was injectors... should i go with bigger ones or stock? i have exhuast, cold air intake, and performance control module... and if i did go with bigger injectors would it be ok as far as the motor is concerned?