CJ5 285 engine. I've noticed it idles very high after I start it and doesn't calm down for about 10-15 minutes, its cold here (snowed last night, don't think it broke 40 today) so I assume the 10-15 minutes is how long the engine takes to warm up the surrounding parts. After the 10-15 minute warm up period it will go back to idling at what seems pretty normal as soon as I hit the gas, ie... I'll stop at a stop light after it warms up and the next time I accelerate the idle is normal. I'm thinking it might be a choke problem, but this is my first experience with a carburetor so I figured I'd ask people who know more before I blindly troubleshoot. Otherwise it seems to run very well, so no other symptoms.