A mechanic looked at the engine yesterday and found that the hard vacuum vapor tube
from the rear of the valve cover up to the front right side throttle body was not connected.
The Chilton Manual (p 4-27) first line says "Verify that there are no vacuum leaks...."
The right angle rubber connector at the throttle body is all floppy and loose - the rubber has degenerated.
Red Arrows in diagram.
He said that a vacuum leak there allows an electronic valve inside throttle body (the IAC),
that controls the throttle at Idle, can't adjust properly with a vacuum leak there.
Probably causing the high idle speed.
A new Vapor Tube assembly costs $27, and I give a s**t about environmental oil vapor leaks -
so I am going to plug up the barb on the throttle body to stop the vacuum leak
Also the larger oil vapor tube assembly at the front of the Valve Cover (over to the air filter)
is all shot with age - THAT assembly costs around $75 if I remember right....
I'll let that alone - no big deal - just feeds into the Air Filter Canister. Blue Arrow.
I'll let you know what happens....