Hey guys new to this forum I had originally been posting over at Mustang Forums but that one seems like its almost dead. Therefore I am going to try it over here and hopefully yall can help me out. I have a 1994 Mustang that was originally a V6 auto and I have converted it to a V8 manual trans with a GT40P motor from an explorer with the fox body throttle swap using a BBK 70MM throttle body and corresponding MAF sensor. The car doesn’t have emissions on it outside of cats. https://mustangforums.com/forum/attachments/5-0l-1979-1995-mustang/77649d1598490390-1994-mustang-gt-whistling-at-idle-img_3469.movI have done a lot of research on this and come up with some different things including filling down the inlets to the IAC and checking to make sure there isn’t a vacuum leak. I don’t have a vacuum leak that I can find and the car doesn’t run like anything I have ever owned that did have a vacuum leak. I also don’t have any check engine lights going on. I am attaching a video clip and y’all can hear the whistle that goes away as soon as I increase the throttle. If y’all have any ideas I would greatly appreciate it.