I have a miss at idle on my GXP. So far I have checked for vacumn leaks, checked all the grounds, run cleaner through it and I just replaced the plugs with NGK 41-108 gapped at .035. The car accelerates and cruises perfectly, but when you come to a stop, the car will idle smooth for about 10 seconds then develop a steady miss that you could dance to. While pondering this, I turned on the A/C and the miss instantly stopped. I turn off the A/C and the miss returned. What does that mean?