Need help with idle!

Thanks johnnymac. FYI, it will idle just fine at 700-800 rpm, I just had the idle up that far to try to keep it running when I put it in gear. Only other thing I can think of is a vacuum leak, which it does have....somewhere. I'm guessing that could be part of the problem too? It also seems to me like it's running pretty rich, but when I try to lean it out, it won't run. Is that a carb issue, or could the vacuum leak be causing that as well?