I got a question guys. I have an 02 gt with the 3.8. I recently did i fuel system tune up at my shop. You know the ones you hook a bottle up to the the vacuum line and raise the rpm to like 1700. Well i have driven it for like 2 weeks, and my motor idles rough when i am in drive and stopped. It idles smooth in nuetral. I just put new autolite 605 plugs in it. I am running a 180 t stat and a couple other mods. Any ideas of what it could be?