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CIS components degrade with age. The degradation is caused not so much by age as it is by contaminants and corrosion (which introduces contaminants). The non-Lambda fuel distributor is purely a mechanical device so the degradation slowly occludes the tiny passages causing issue. The WUR is both mechanical and electrical and can suffer from the same occlusions as well as electrical component degradation. At some point the system degrades to the point where fuel pressures and volumes reach levels that are close to being out of spec. That is where you first see issues. At that point I would clean everything. Change the filter, pull the lines, flush and clean everything including the fuel tank. Maintenance buys you time. Once the system is out of spec the components need to be rebuilt and, of course, everything must be flushed and cleaned. I am not a proponent of adjusting the WUR to compensate for a problem - fix the problem.
The vast majority of CIS issues we see could be prevented or at least offset by cleaning and maintenance. Keep the filter changed, inspect and clean the WUR screen, replace old dirty injectors with new, and drop the fuel tank for a full clean out. How often this needs to be done depends on how often the car is driven. The less you drive the car the more frequently you need to maintain the fuel system as it sits and rusts while the water separated out of the gasoline...
...rebuilds for a lot of FDs and WURs, it is unbelievable the shape some are in and the car still runs.
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