I have been having ths intermitent rough idle for quite sometime know,had the car at the dealer last week where a buddy of mine works at,checked the car pretty thoroughly for any vacuum leaks,used the Ford IDS software to monitor and check for any misfires,fuel system and everything was fine,he mentioned that the 13+SHO have a common problem with a faulty injector as many of you are aware of,due to the holiday weekend wasnt able to check the injectors by putting a borescope in the engine and cranking the car over,the faulty injectors tend to leak even when the car is not firing,something to keep in mind is that a bad injector cannot be diagnosed with software or sct programmers,will keep you updated.thanks Z