I haven't touched the carb. When i traded my cj2a and bobcat welder for it. It was my first time buying a jeep. He didt really tell me why it was idling so dang loud. All i did was changed the filter, spark plug, painted the rims, changed the oil filter, changed the engine oil at the same time to, changed the transmission oil and transfer case, changed the rear and font axle oil and dropped and cleaned the old gas tank. He said he had the engine rebuilt. its also been sitting for about ten years.