I don't think you said what type of Jeep you had, but I'm going to assume that it is a carbureted engine. In that case, I'd first suspect a float level adjustment. Or a weak float valve spring.

You probably don't need to replace the carburetor, But I would clean it out inside and install a new carburetor kit. They're inexpensive and well worth it. I do mine every 15 years, whether it needs it or not! <img src="/forums/images/graemlins/smile.gif" alt="" />

1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.