My svt is doing the same thing. I am in the midst of fixing mine up tho. I replaced all my vacuum leaks with new hoses. My IAC valve is old and it has about 10k miles on it. I am just going to replace it with a new one and see if it changes anything. Id like to get a motorcraft but i know they...
I cant buy the entire car, but If you decide to part this car by any chance, i would be very interested in a few things.
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It could also be a vacuum leak. My svt has done this as well. The small hoses on these cars overtime become brittle and crack. I replaced most of mine and it still does it sometimes so i figured i may has missed one. If its not the TB i would check all your hoses as well.
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I have had this issue in mine. The regular v6 contours use a different TPS than the svts and the svts are quite difficult to find. I would start there and make sure you have the right one.
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I know this is an old thread, but I have a stock air box with a k&n drop in, also with the accordian tube out of a 1998 svt
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