1994 Roadmaster Wagon hard starts, stumbling idle, CEL code

[94RMW]

My '94 wagon has been acting up recently. It often takes feathering the gas pedal to start it and it audible struggles while idling in drive. My CEL was on and it is throwing four different OBD 1 codes. Specifically:
27: Exhaust gas recirculation (EGR) vaccum control signal solenoid valve circuit
26: Evaporative emission (EVAP) canister purge solenoid circuit.
48: Mass air flow (MAF) sensor circuit
63: Bank 2 (right) Heated oxygen sensor(HO2S) circuit (open circuit)
Not a skilled repairman, so can anyone give me an idea of the kind of parts I should look for? Or if there's any troubleshooting I can do?

 

[HotZ28]

You got the codes, now you have to decipher the meaning of each code & possible solutions. There is are a lot of research yet to be done!