318 makes popping noise on number 1

So I had some time today to mess with this thing. I pulled the plugs found a couple in not so good shape. Mainly to due to a predetination problem that it had when I bought it. which i corrected the day i brought it home. New plugs took care of the miss but not the pop. I pulled the valve cover and discovered that the intake lifter wasn't priming up. another thing to love about mopars, you can see the lifters through the head without pulling the intake manifold. Gonna put it back together tomorrow and see how it acts. Will update after that thanks for everyones help.