My black box looked exactly the same as yours, but my A/C idle booster was not working (not a big deal anyway). It turned out one of the small solenoids inside the box was dead (there are two similar ones, the other is for the distributor advance -extra advance it seems). I harvested a couple good ones from the junkyard (one for spare) and got it fixed.
x2. No need to fix it -other than pinging- unless you have to do smog/emissions.
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