2.6 carb/choke part

[mona's k]

I am asking this on behalf of an acquaintance who has a '84 Lebaron with the 2.6

His car runs poorly at start up in the summer but OK when the weather gets cooler. The repair shop he took it to told him that some part of the carb/choke is not working correctly and needs a new one but they could not find one through where they get their parts. Any idea what part they are talking about? I offered to check on the internet for him to find the part but first need to know what I am looking for. He had a new carb (factory rebuilt?) put on a few years ago but this problem stated earlier this year.

[K-CAR_WAGON]

..

[mona's k]

I thought it may be a common problem on these engines and somebody else has had the same issue.