Yeah an aftermarket fuel pump is much cheaper, but as far as the codes from I was reading I would start by checking the MAF out, all three could definately be caused by that, check the plug, and maybe clean it, make sure it's seated right (has it been taken out or has anything been done near it that could have changed anything?)

 

Pretty fucked up story honestly. So what happened is snow must have been rubbing against my fender well and rubbed a huge hole in it and my tire just threw snow into it for hte past few weeks and my whole bumper/wheel well was full of snow right where my intake sits. LIterally maybe a foot and a half of icy snow around my intake and maf. Changed my air filter and maf, bought a new fender well, and had to buy a new downstream o2 sensor because the snow ripped the wiring from it. Havent put that in yet. Have to clean my throttle body too because now its idle surging with clutch use.