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2002 Mustang GT. Idles horribly now and steps all over its toes...sluggish. I found a moderate vacuum leak at PCV line and corrected that. It may or may not be relavent but it ran better but now has gotten worse. This thing had ran incredible and problem came on within a week or so..progressively. 90k miles. anything?? any help at all appreciated much
Any codes? Did it start right after fueling up? Like above, check over all the vacuum connections and have a look at the spark plugs, make sure the coils and injectors are working... start with the simple things and dig in from there, if it started acting up in such a short time frame it's likely something simple.