Help! Drivability

[kwin]

My 1991 suburban sat for nine months while I had major health health issues,
Over the winter the heater core began to leak, replaced the core last week, thursday I was allowed to drive for the first time in nine months and half way to my job it started sputtering.
It sputtered under load, over the last few days the sputter has gotten worse.
Today I replaced the fuel filter, fuel pump, plugs and wires all because tune up was necessary or a hunch in the case of the pump.
No change!
I took the burb to a local garage and had it hooked to a scanner, no codes and all sensors are functioning.
The main vacuum line was in poor condition so I replaced it and nothing changed.
Has anyone else been down this road?
Any suggestions?
I need her for work, and after being off for nine months I need to work bad!
Any suggestions would be appreciated.
Keith