What's with my motorcycle?

I got a Honda Rebel, and just today when I was riding it I noticed it sounded really weak. I thought it was because I needed gas but I filled up and it still sounds like it. If i'm not giving it throttle it'll sound really low and weak and eventually it'll shut off but it'll start up right away again if I hit the starter. So is it my carbs? Maybe the fuel line is dirty?

Have you ever cleaned or replaced the air filter?

Check your muffler bearing or your thermostat.

Find the idle screw on the carburetors, this is a fancy word for it hold the throttle open just a tiny tad open to let enough air/gas to keep engine running, if its not open enough then the bike is not getting fuel, and what engine wants to run without fuel?