Intermittent engine miss, codes P0300, P0303 and P0305?

3 weeks ago, my wife's car started missing, check engine light on with code PO300. The next day PO303 and 305. I put plugs, wires, coils, fuel pump, fuel filter, PCV valve and hose, all vacuum lines. The car ran like a new car until now, today I'm driving 35 to 45 MPH and the check engine light turned on. I put scanner on it PO305, I'm lost now.
Thinking fuel injectors but I want an expert to give me the next step, idles rough, hesitation on take offs, jerking and now this time when you turn on A/C it stalls out. Help me guys thanks, bambam