I was the recent winner of a 85 2wd extra cab sold to me by a friend. He had it sitting because of running problems he couldn’t fix. So here goes.. it starts and runs ok but a little rough, but when you put it in drive it wants to die and runs really rough.. I have changed cap, plugs, wires... when listening to it I hear a rattle/gargle cling from behind the carb I think from one of the vacuum valve.. any ideas or fixes.. thanks for all your help