Is there a procedure for cleaning intake manifold flaps?
From what I understand the manifold is not able to be opened.
I have done a carbon cleaning and they flaps on the intake manifold are still dirty. I am terrified to clean them as there is no way to to get inside to clan up with residue mess.

I have put my car back together after walnut blasting the intake ports and now Im getting intake manifold flaps stuck closed.
I have a feeling this may be an issue of them being dirty.