Ok at the risk of showing my mechanical ignorance. I bought a 1989 YJ. I love it. However, on cold mornings it will not idle. Once it gets really good and warmed up (20 or 30 minutes), it runs great. Sometimes it even struggles on warmer mornings. My inital thought was I need a carburator, but after reading some of the threads, it sounds more like my choke. And here in lies my ignorance, Is the choke separate from the carb? I thought it was part of it. And when I was pricing carbs, I found three different ones, how do I know which carb I have? Any help would be greatly appreciated.