Briggs 28A707 engine pulses throttle and won't idle smooth

[Craftsman Garage]

my snapper sr1028 with a B&S 28A707 engine just won't idle smooth! it pulses no matter what the needle is set to (there is only one needle). and when it is a little bit below half throttle it the engine bogs down. any help would be appreciated asap, thanks.

 

[Hammermechanicman]

The carb idle circuit needs cleaned.