Donald, thanks for the post. Just last week when I was watching the last diagnosis (I have another scheduled this coming Wed - the idle is still unacceptable), my tech was adjusting what I think you're talking about. It's just to the right of the fuel distributor... and the tech looks over at me and says "Never adjust this. If someone comes up offering you a ??mm Allen wrench, just say no". I never circled back in the conversation to confirm WHY that was sacred... I think it may just preserve the gulf between Tech and regular humankind... like "don't eat the fruit from that tree" kinda stuff.
I'm a sinner: What size Allen wrench do I need?