Bought my first jeep about a month ago, and love it so far! Its a 2000 wrangler 4.0 automatic. It has a 4 inch lift with 35s on it. Every once in a while when i stop at a light or something it acts like its miss firing. I bought a new coil and plugs , but it still does it from time to time, any ideas what it could be eould help a lot.