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Interestingly enough, I have had 104 code 19s that were vac related [lean] and the fix on one was a intermittant /sticking open purge valve.. [ common part failure on these]. MOT on left fender well... feel for pulsations..archieves
This was finally found by plugging each vac system and driving the car for periods, waiting for a code.

The other was a sticking EGR valve .. this is also common on 104s and there is a TSB out on the part replacement..
Both of these vac leaks are a little tricky to find BC they are Internal leaks and intermittant..
The EGR was easier BC I also had EGR codes.. but the purge did not code out..
Granted , I did not have access to limit values at the time , but have not had a code 19 return on either since...[2 yrs]