Yes, that's correct. There is coolant that runs through this section and will leak onto the idle sensor unit and will short out the ECM gradually. It will act erratically with RPM jump then finally stall out.
Well I'll be-- you're absolutely right:
Just never paid any attention to it before.
Pic of my odometer just for kicks :
What's really amazing is that ALL the electrics still work- all power windows, door locks, sunroof, everything.