30k for a 30 year old vehicle sight unseen is a pretty big roll of the dice. Like others on here when I looked through the photos there were a lot of little things that left me scratching my head but I've also owned an 80 series for ten years (sounds funny to say it out loud) and have looked at pretty much every nook and cranny in that thing multiple times.
From what I'm seeing these are all fixable things, just really unfortunate that you have to deal with them on a top dollar cruiser.
As for the technical issues... go through the FSM and follow the steps but here's my hunch:
I'd start with fresh 02 sensors, a fresh engine wiring harness, pull the upper intake and replace all the vacuum lines, PHH (pesky heater hose) and related coolant hoses, etc (while you are in there things) and adjust the IAC and TPS per the FSM. This made a massive difference on my 94', it runs and idles so much better than it ever did before. The wiring harness gets old and crispy causing all kinds of drivability issues, some show up as codes and others are intermittent.
From what I'm seeing these are all fixable things, just really unfortunate that you have to deal with them on a top dollar cruiser.
As for the technical issues... go through the FSM and follow the steps but here's my hunch:
I'd start with fresh 02 sensors, a fresh engine wiring harness, pull the upper intake and replace all the vacuum lines, PHH (pesky heater hose) and related coolant hoses, etc (while you are in there things) and adjust the IAC and TPS per the FSM. This made a massive difference on my 94', it runs and idles so much better than it ever did before. The wiring harness gets old and crispy causing all kinds of drivability issues, some show up as codes and others are intermittent.