mixture too rich: "choke" (non-choke) stays shut

What is your question?

I was getting sputtering on acceleration only after car was warm. I looked down the throat of the injector intake and noticed that something looking suspiciously like a choke was closed, so I put a wire in to hold it open and took her for a run and she ran fine. So is this controlled by a temperature sensor or something else to replace or adjust?