Rough Idle and exessive smoke
 

I recently bought a 79 Cj-5. I am having 2 problems that are beginning to
concern me. The first is that the engine is smoking exessively. It is not
oil, but rather gas. Sometimes it won't smoke at all and other times I
can't see behind me theres so much smoke.
My other problem is that the engine has a very rough idle. When it idles,
it shakes exessively. Any ideas to what the problem may be?