Most reasonable people would argue that openly carrying a firearm in public is, by its very nature, intimidating.
Depends on how you're carrying it.
No it doesn't. When you keep a deadly weapon on your person and it is visible to others, you are sending the message to them that, "I could kill you if I wanted to." If that's not intimidating, I don't know what is.
You don't then. Intimidation would be sending the message "I could kill you and I want to."
No, that would be a threat. Literally, intimidate means "to make timid", presumably through a show of force.