I just got a new thermostat, fan, radiator, tranny cooler lines, new tranny fluid, new headers, X-pipe, and spin tech mufflers. The second bolt from the left on the passengers side Header wouldnt go in and someone told me that it wouldnt really matter?...So when I start up my car it will idle very rough for like 30 seconds then smooth out. Whats the problem guys? Also my motor mounts are in for some new ones. I have no knowledge of Mounts so let me know as much as you can.