Rough running Johnson

[FitzyADK]

Hello. Newbie here. I have a 30 hp Johnson that idles rough then quits. No problem running at speed. I tried Sea Foam but can't really tell the difference. The gas is fresh, the fuel filter looks clean. The engine was bought around 2001. I will try to upload a video of the issue. Thanks!

 

[Boobie]

Start off with a compression test and report back.