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Do you still have your emissions system? Check all those hoses, they are super brittle and will break with ease. You mentioned someone ghetto rigged an EGR hose, so there's a sign of trouble already. Perhaps consider removing your intake manifold and getting rid of the emissions system and replacing the coolant and vacuum hoses with new units.
If that's not an option for you, spray starter fluid around your intake manifold/EGR/vacuum hoses and see if the idle changes at all. Sounds like a pretty bad vac leak.
You can also make a ghetto boost leak tester and stick in in your throttle while open and put some air in the intake and see where it leaks out, be careful not to pump too much air in it, though.
Code 55 can almost surely rule out any sensors/faults in the EFI system. Could still be stuff like bad injector/running pig rich due to bad inj. seals, etc. Vac leak test is free and easy so try that first.
Also, I had a bad idle in my first KA kind of like yours, and removing and cleaning the IACV thoroughly and reinstalling with new OEM gasket worked wonders! It's not too bad of a job if you are patient.
Hope this helps!
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