2002 Saturn l300 running terrible throwing codes p0300, p0502 and p1780.

What is your question?

I have a 02 l300 with 60k miles two weeks ago I was on the interstate and it out of no where started running rough then shut off and wouldn't start back up. I got it towed to my house and found that the fuel pump was not working so I replaced the pump hoping everything would be ok. After the new pump was installed I started it and it was just running really rough, misfiring and stalling on idle. Since then I have replaced my MAF sensor, coil packs and plugs. I checked my injectors and found one was damaged on the spraying end of it so I replaced that one and cleaned the rest of them. Nothing has made a difference at this point and I don't know what to do/how to determine what is thr cause of the misfiring, the p1780 and p0502 code being thrown. Has anyone experienced something like this that you might have some guidance on how to resolve these issues?