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The rubber vacuum components under the distributor/air mass sensor assembly and those going to and from the ICV are quite hard (impossible) to replace without removing the air mass sensor.
There are also lines going to the ICM (Ignition Control Module on driver fender) that need to be replaced with fresh rubber. The plastic lines can be cleaned inside with carb cleaner. Or replaced with new.
Later models will have EGR vacuum lines too (emissions). Behind right headlight - difficult to access without removing anything - as well as vacuum lines inside driver fender. There is a large (probably heat faded too) valve on the driver fender near the alarm horn that distributes vacuum into the fender and to a reservoir (I think).
Taps to the economy gauge and transmission lines are also common sources of leaks - they tap directly to intake manifold vacuum, which means they get exposed to hot elements.
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