4AGZE wont idol hot

[rollie69]

When it starts to get to operating temp, like when you've been sitting in traffic it wont idol at all. It's fine while it's cold though.
I'm not really sure but does it have anything to do with vacuum or hot idol valves?
When i'm driving (without having to sit in traffic) the car runs almost cold due to my plugs being 2 series colder. but once i stop and sit in traffic it doesn't overheat but the temp gauge gets to a normal operating temp and al it wants to do is stall. I'm forever having to rev it when i stop at lights.
Any clues i've done a search maybe i'm not entering the right info but i couldn't find anything.

cheers

[allencr]

car runs almost cold due to my plugs being 2 series colder.

No, that's not what spark plugs do or what they're for. Search!
Thermostat installed?
Running well only when cold is usually an indication of the choke/cold start system staying on and/or running too rich.
Adjust the idle when hot.

[Kebin]

check for vaccum leaks... also cracked-perished vacuum hoses