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Ok, maybe my final status update here.
It's running!
I went and re-checked all of the grounds. It turns out I missed an important one: the injector harness at the valve cover bolt! It seems it had been crossthreaded at one point and was basically just sitting in there, finger-tight in the one thread it had left. I moved them to a different point, got them all cleaned up, and it started right up and stayed running.
I adjusted the idle with the car actually running and now it's rock-steady at a hair below 900rpm.
And to answer the last question, I picked up the hose kits from Greg Gordon and everything else came from IAP. The car was a non-runner when I bought it and I was just doing general tune-up stuff. Then it ran great for a couple days and acted up like this.
Like Greg says, Alfa attributes 80% of its problems to bad grounding. Anyway, it's working now.
Thanks, everyone, for all of your help.
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