I am going to get my dyno tune tomorrow for my 00 GT with procharger p1sc. I had a new short block put in and it has been sitting in the garage for several weeks waithing for a nice day to take it to the tuner. yesterday I let it run for 10 min and when I turned it off it sound like a rushing wind coming from the throttle body. it haver made this noise before but now it does it everytime I shut it off reguardless of how long it runs. Any clue what it could be? Thanks!!