Thanks guys ! At this point I've got all the fluids changed, injectors are flowing good again (fuel trims were initially like +20, now down to about neutral), and I got the rear tires replaced. Tire shop ran into valve stem issues getting new rubber on these 3 piece wheels, and were only able to dig up 2 oddball stems that would work on short notice. So they're going to hunt down a couple more and shoot me a call. Meh, I'm driving it in the meantime anyway