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Message: <blockquote data-quote="x182dan" data-source="post: 684922" data-attributes="member: 9725">Ok guys I've been chasing this for about a year now. Heres what I've done and what has happened. I originally had a professional products 75mm tb on there. I went to get the car tuned and the tuner found a problem with it. The iac didn't sit right and the throttle blade wasn't sitting correctly either. Also the car didn't have any hanging idle issues with the pp tb, but it did surge like hell because it wasn't tuned yet. I got a bbk and had the tuner install it while he had the car. So I never had the bbk tb installed without a tune. I got the car back and it had a minor hanging idle very minor he said it had something to do with these ECMs. Then over time it gradually got worse. It hangs around 2k for 1-2seconds before it drops to idle and it when I shift the car from gear to gear. I replaced the IAC twice. TPS voltage is good. No CEL has ever come on. I replaced the intake gaskets with zero change in the idle. This car also doesn't surge at all except when its real cold and I first start it but only for 10-20seconds then its fine. Any ideas? Should I assume its the throttle body? I was thinking about doing a foxbody tb swap but I don't really think thats gonna fix it. I unhooked the battery to reset the idle and it still does the same thing. If I unhook the IAC with the car running it dies right away.Any ideas?Thanks Dan</blockquote>