[Steve M]

You may still want to investigate why the idle screw doesnt come out all the way. It may not be a good idea to spray it directly down into the manifold. You could get whatever dirt is stuck in there into your intake.
Not to insult your choice in method of repair, but I would never trust a grease monkey to work on my car(s). Not even a dealership, very rarely do they know what they are doing. I can say this because I used to work in a body shop and saw the quality of personel at these 'mechanics' rodeo's.