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I think you're right, leave #1 for last. That ignition system is terrible, so touch it as little as possible. Spray corrosion inhibitor everywhere. Read the bottle first- it should be non-conductive. But don't do that until you solve the idle problem. What do you mean by 'sleeves'?
2- Vacuum is generated by the motor, and it wants to keep it. If one of the hoses that routes the vacuum around the car leaks, the car sucks in air it doesn't need and then is running fuel-lean, or just stalls. This could be the problem, but it wouldn't be a small leak. Check to make sure all the rubber hoses are nice and tight, and don't have cracks. Sometimes they'll crack at the connector, move it around to check. You might be able the shorten the hose a bit and re-use it. Keep them clean of oil, and make sure nothing's vibrating against them that could cut them over time.
3- A dirty throttle body could be it also, easy enough to clean, you should at least remove the elbow and look up in there with a mirror. The biggest problem there could be a blocked vacuum connector, and that can only easily be checked by removing it, although you could attach a vacuum tool like a Mityvac and see if the ports are clear that way. Don't use carb cleaner, you're supposed to use 'throttle body cleaner'. Read the FAQ under 'Features'.
Another suspect could the idle air motor. It sits under the intake manifold, has one electrical connector and two 1 cm or so ID rubber hoses. Take both of the hoses off and spray a small amount of cleaner in here. Maybe brake cleaner, maybe someone will tell me I'm nuts, use whatever you like. There's a little vane in there that the electrical motor opens and shuts at different frequencies as needed. If this stops working, it could easily cause this sort of problem, as it controls idle. I'd check that first. Make sure the hoses are tight and clean when you're done, at both ends of each.
Good luck-
-Dylan
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