After thinking about it I decided not to replace the check valve.

I cleaned (rinsed) the idle control motor and seem to have corrected the problem.

I had the same problem removing the idle control motor as some others have had. The nuts on the back of the plate were loose and I was unable to (not small enough 10mm wrench and hands) secure them while loosening the 3 bolts. The idle control motor is (like the flame trap) not readily accessible with the intake manifold in place. After about 30 minutes I just gave up.

Instead I removed the hose from the air filter hose (just ahead of the throttle body) and poured about 4oz of throttle body cleaner down it. I let it sit for a couple of minutes then started engine.

Probably just a temporary fix but initial idle problem is now cured and warm idle is smoother at this time.

Given the gum and bailing wire approach I used I expect the problem reoccur. When it does I will make a better effort at removing the ICM for workbench cleaning or replacement.

Thanks to all for suggestions.
Howard