The good news is I have found the main problem, sort of! All you who assisted and said vacuum leak were correct. But where the leak is caught me off guard.

In tracking every vac line I came to the large line connector to the left of the throttle body air intake that goes into the intake manifold. Upon pulling the line and plugging the tap into the manifold my idle immediately smoothed out. The motor purred again! By this time the engine was warmed up.

Tracing down hose from there looking for a vac leak I tested every hose and connector under vac pressure. Every hose OK. Not a bad hose in the entire system. Then I reconnected it one section at a time. When the C4020-13554 Warn up regulator was reconnected it went ruff again and I had major engine hesitation on acceleration.

It appears that I have a vacuum leak internal in the warm up regulator diaphragm.

Does anyone know if a rebuild kit is available, or will I have to build my own diaphragm parts?

I am certain I can do something as the regulator is not staked together, but it never hurts to get a kit if possible!

trants4md