i need help adjusting my timing with my sct tuner, all my mods are listed below including an o/r x-pipe, my car has an odd idle and it almost seems like it is skipping at 2000-4000 rpms i just changed my plugs last week with only about 10k miles on them they were already fouled out, the car ran good for a while with the new plugs but its right back to were it was. can someone give me some advice??