if its idling high that could be an vaccumn leak someplace like a broken hose or bad intake gasket or TB gasket etc..
as for running like ****, i would gap them at what the book says, and first things first can you get a fuel pressure test guage and tell us the fuel pressure, i am thinking it could be fuel related, so i would start there.
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Dustin
2002 GT Mustang 5-Speed
Drag Radials,Sprayed,Powershifted
 
WOOO HOOOO!
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