Originally Posted by 911medic
I think the power loss, if any, would be gradual enough to make it difficult to notice.
If the build up is soley from the PCV products, then yes, you should have very little further accumulation.
Sorry... You didn't ask me, but I answered anyway.
Correct. Few notice as the buildup and reduction in performance and economy gradual. But after a good upper induction cleaning most notice right away the improvement.