Ryobi leaf blower idles, give it gas it stalls

loosen gas cap. Probably a bad Vent in the gas cap

sounds like you have either a dirty carb or a small air leak

Take better care of your equipment and it will last longer

there is a gasket right under the prime plug most likely that is bad

Not sure if your model has two throttles or one. It should have a trigger and a thumb lever. Be sure the thumb lever is closed. if that is not the problem your mixer might be to rich. it says 50:1, but use 40:1 and see if that helps

remove the muffler and run it if ok with the muffler off open it up and clean the screen inside

remove the muffler and try it if ok with out it open the muffler and clean off the internal screen

could be a bad plug or carb is out of adjustment

Sounds like you need to clean the carb. Buy some carb cleaner and remove the lines to the carb and gently spray cleaner into each of the holes. Reconnect the lines.
Good luck!

some carbs are not adjustable,check your air filter first to make sure its not rescricted and also a new plug,make sure your fuel is fresh,now if you do have adjusting screws,most have plastic caps on them with preset adjustments locked in,you will have to remove these caps to adjust,they need not be reinstalled,Hope this helps