Idle on startup can be pretty choppy if the engine is cold, but it should not take long to hold it's own idle. FWIW, my Warlock will idles around 600rpm in gear when warm, there's no reason for it to be >1,000rpm. I would target no more than 750rpm on the throttle stop [assuming you don't have a fast-idle w/o a choke]
When the engine is warm, the idle is at about 800 RPM. My question was on a cold start up as my car idles down low. Every other car I have starts idle >1000 RPM and drops as it gets warmer. I'll have to see if I have the fast idle screw on the passenger side of the carb. Hopefully this weekend.
Anything fuel injected will either have an idle-air control valve [IAC] or an electronic throttle body to deliver more throttle/air input on cold starts and idle high. They also have a direct input of engine temp [ECT] to know when it needs to high-idle or not.
Carbs managed this through a fast-idle cam, however the carb has no reference of engine heat without the presence of a choke, therefore it is likely not on your carb if you do not have a choke on it. Factory operation would kick-on the fast-idle when the choke is closed and kick off upon throttle input and an open/opening choke.
