I have a 90 wrangler with a 4.2 I6, stock carb and it is idling high (about 1300 rpm when warm). I checked the adjustments on the carb and the screws are not even touching the parts that cause the idle to increase. I can manually grab the linkage and pull it up just a bit and this causes the idle to drop to about 1000 rpm. I cleaned the linkage really good with carb cleaner just incase there was some debris in there making it stick but that didn't do any good. Someone told me it could be a vacuum issue. Can anyone elaborate on that statement please?? Thanks!!
I upgraded my carter carb to a MC2100 carb with a manual choke. I installed the carb in the summer and never got the manual choke installed so it started running high rpm about 1500 this fall when the choke is left on so I kinda stuck the choke open and it idles fine now but is a bit harder to start when cold. I would check your choke and vacuum lines also. I had lots of problems with the original vacuum line system. good luck
1990 Sahara Wrangler MC 2100 carb rest stock so far