mark lewis wrote in a message to Roy J. Tellason:

RJT> I'm missing something in my understanding of this,  since the
RJT> only thing I can see that goes through that TB is air,  and
RJT> that's going into the intake valves.  How would residue due to
RJT> fuel additives get up there?

ml> is there not a PCV valve in there somewhere? does it not pull 
ml> "fumes" from the crankcase and feed them back into the airflow to
ml> be burned again?

Right.  I'd forgotten about that...

I even know where it is,  and will have to look and see if it's close
enough to the throttle body to account for some of that.

---