Irregular Rough Running
Check your
valve adjustment. If they're too tight, you can get a rough idle when the engine warms up. Beyond that, and making sure you don't have any funky (cracked/spongy/holed/etc) vacuum hoses, you have the correct PCV valve, etc, tune-up parts and technique suggestions in
this post, and carburetor operation and repair manuals and links to training movies and carb repair/modification threads are posted
here for free download.