I've got a 1996 Blazer with the three button 4WD and the A/C cut out on me, shortly after the car started to overheat just a tad and then it wouldn't start unless I had my foot hard on the gas. I stuck my head under the car and heard a very large vacuum leak. Upon further inspection I found this line split. It is located before the Cadi right after the exhaust manifold I believe? Take a look! Have any idea on what size line it is, and how far + where it goes? (It looks like its rounded together with two other ones heading in the same direction toward the rear.