Carb is a rebuilt unit I got through a local parts store, it isn’t leaking, the points condenser and cap are all about 1 year old. The fuel pump is only about 1 year old. When the vacuum line is unhooked from the vacuum advance the truck back fires pretty much every time I give it gas and improves a lot when it’s attached. A little over a year ago it all of a sudden started doing this. That’s why the all the parts are about one year old. Started with a basic tune up which didn’t help then I put on the fuel pump. Tried rebuilding my old carb but it needed expert help so I bought one already rebuilt and installed it. Other things in life got in the way and now I have some free time to work on it. But I am getting pretty frustrated with it. I’ve even talked about selling it but my wife says no.
