1982 stock carburated V-6 2.8 manual Sports Coupe. Starts fine and once fully warmed runs and idles fine but can't keep running during warn-up without keeping on the gas. I've advanced the choke considerably with little help. After the choke comes off after a minute or two and until hot it won't stay running ... takes 5-10 minutes. Repalced temp sensor. Not sure where go next. Anyone have any ideas. I'm the original owner and have the full vehicle history but never been stumped like this before. :(

It sounds like your choke is coming off to soon. Is it set to all the way rich or to lean ? It should be rotated towards rich.

Do you have a heat riser? if so see if that is stuck