Slant 6 wont idle after warm

Car ran fine for a couple of months. Now after I travel for about 5-10 miles it will not idle when I pull to a stop. If I am on the freeway it runs like a champ. Once it cools I can restart it and it idles. I was told possible vacuum leak. I checked the intake/carb bolts and they appear all tight. Also I was told to check/replace the points and coil. Any suggestions?

Thanks in Advance, Darryl