That is what we are thinking it maybe. I went ahead and bought 20 feet of vacuum lines. This truck still has vacuum lines from the factory, only found one bad one, believe it or not. Going to replace all of those. I bought a carb rebuild kit. Holy crap there is a lot to that carb. Not sure if I want to tackle it myself, or just pay someone to rebuild it.

Someone that I know that rebuilds carbs, of course he says he won't try to rebuild this one, told me to just unplug the mixture screw and adjust it. That will make up for any vacuum leak, and it is the easiest fix.