I was having similar problems with my 88 YJ and messed around with the carb for about 3 months before I finally just yanked the stock carb off and put a Weber on. I am sure all the guys in here that have the Webers will tell you the same thing...."Remarakble improvement in every aspect of performance." You can play around with your carb more or just bite the bullet and invest in a Weber.
88 YJ with a 78 258 bored .030 over,Weber,Nutter Bypass, Juice Box and Herculined. Paint Job, 2.5 lift and tires coming in the near future!
2002 WJ Limited, 4.0...all stock...the wife's car!