Check engine light flashing, engine misfiring and codes P0304, P0303, P0300?

Hello, my mom has the car listed above. She was driving it and it all of a sudden started missing and the check engine light was flashing. Now it’s to the point it won’t move when putting it in drive it just misses and bogs down I have replaced part after part like the distributor, fuel pump, injectors, plugs, fuel filter and it’s still doing the same thing. I also checked the converter it’s been gutted. Can anyone help me? She is disabled and has a lot of doctors appointments I try taking her, but she can’t get up in my truck. It’s throwing codes p0304, p0303, p0300, p0170, 45-9, 73-1, 74-1, 71-9.