Hey guys i have a 2004 gt and i had a matalic tick on my driver side. Turned out that one of the lifters colapsed. I also have a small friction indention on my cam(VERY small), and i was woundering would that cause any major problems for me in the near future? Now i have an idling issue. Sometimes it idles fine and sometimes its like a box of chocolates, you never know what your goin to get. My dad seems to think its a vacume problem. The IAC is brand new by the way. Any ideas?