SO I just had a brand new Weber 38/38 carb. put on. It replaced a Holley 4300 2barrel, that under no circumstances would pass emmisions. So I'm driving the CJ home and notice a hissing sound. Could this be a vacuum leak or is it just noisy. All of the vacuum lines look to be on properly, and the shop that did it is very reputable. Also, the linkage that changes the direction of the cable seems to be very loose. It has several nuts that hold it on. should I tighten them or leave the loose. I know squat about the Weber and am going to buy the manual soon. If anyone has any tips also, that would be cool.