Rough idle when warm??

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LIL SS

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Apr 26, 2004
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I'm trying to help my sister out with her 91 Taurus. It's a bone stock 3.8.

On cold start it runs fine, good solid idle. As soon as it warms up it starts running very rough. I am leaning towards the MAF being the issue but have not worked on these cars before. Once warm it has the same manners my 01 LS1 has if I disconnect the MAF while running. Searches for idle and runs like poo.

She has had it in a shop recently and they did the fuel pump, vacum lines and a couple other that I am not aware of. Any help would be great.
 
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