stumble
Hard to say without an actual code that comes with a check engine light. With the info you have so far I am thinking vacuum leak. One of the lines is loose or disconnected or pinched or maybe even an air sensor or throttle sensor. I would try and pull a code or even take it to a shop that can put it on the scope and get snap shots of the air/fuel numbers. A good shop should be able to have a few ideas.
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Jake 95 Mustang GT. 5.0 Convertible (Sold)
02-11E Saleen Convertible
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