ok he is the problem took my 2000 mustang gt to a ford dealer to have test ran to see why my cars idle was jumpy only when coasting to a stop or at idle in neutral it came back IAC so i replaced it and it still is jumpy since i got a new battery and TPS still jumpy what is going on is the TB bad or a senser somewhere PLEASE help this is driving me nut [align=right][/align]

 

could be a couple of things, first check your hoses, you may have a vacuum leak. One way to test this is get some carb cleaner and spray some hoses and seals. if your motor reves then it is sucking in the carb cleaner and you have a leak. two, check your connections. You may have one lose or one is going bad. pull them apart and make sure they are clean and then put them back together. Hope this helps.