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You could put a hand vac on the dist to the low pressure side and with vac it should pull timing back about 10 deg and the rpm should drop. If it dose, it is not the pot. You could also put pressure to the other side and it should retard timing also and drop rpm.
You could put a vacuum gage on the vac line and see if you are getting vacuum. If not, your issue is up stream.
There is a solenoid on that line that stays closed for a short time upon start up when cold to bump rpm. Then it opens after a short time. It would be good if that solenoid fails in a closed position so you would still get boost retard. If that is the case, this might be your issue.
I could be off bit I believe this is correct. Let me know what you discover.
Again, I belive that solenoid is essential for proper retard on boost with the double conection pot. If it dose not close under boost, I suspect there will be no retard.
I have read that some have eliminated it thinking it is a smog part. If I did not have it, I would leave the vac-retard side disconected.
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