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hey so my 2013 crf150rb has been having sputtering problems and hanging idle i have cleaned the carb rejetted it with a 40 pilot 145 main i did the valve clearances and put them all in spec i bought an aftermarket air/fuel screw for the carb because the stock one would vibrate out of place and fall out i have messed with the fuel screw and still have sputtering and hanging idle i checked the throttle cable and it snaps back perfectly i don’t know what else to do to fix these problems i would appreciate if someone can give me some tips or help on what i should do thank you.

Look for a vaccumn leak around carbs .. spray a little carb cleaner around it to see if it stumbles , or picks up ...Usually around boot connections or intake pipe ...