If you're reusing the bolts the car came with at least measure them to make sure they're alright. Personally, I wouldn't go 72lbs on 20yo head bolts, maybe mid to upper 60's. As long as they're within specs though you should be fine.
51 and 52 common? Dunno, never had either myself.
Is this a vacuum line? If so it may be part of the vacuum routing for the ACIS. Most of that system is tucked under the intake manifold. If your vacuum lines are bad enough to just fall off, it's time to replace them. ;)...
I don't remember the specific range, but the idle is supposed to be in the 1000RPM area with the A/C on.
As for the leak could be a gasket, vacuum line (there are some that are hard to see under the manifold) or possibly the ACIS diaphragm.
To continue the explanation of this circuit - A comparator operates like a MAP sensor in that it doesn't sit in the middle of the circuit it's monitoring. It just samples from the side. As such, unless there is a strong power surge or water damage, the comparator and the simple components which...
Think of that as the ultimate in last measures. There are so many other factors which can cause your idle to change that simply adjusting that screw can hide a bigger problem that's just waiting to get worse.
Naturally we recommend you support Toyota and the publishers by purchasing a physical copy... then you can burn the Haynes. ;)
So did you get everything taken care of?
Pull the distributor and physically verify the timing of both that and the cams and crank.
The coolant thing could just be a bad thermostat or rad cap... so start with those and work your way into the lower pits of hell from there.
Have you seriously not seen those before? They're the ultimate baller badge.
On the down side, IIRC, they require you to send in your lenses for upgrading.
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