JD L118 runs rough

[Dave Jenkins]

My JOhn Deere L118 has given me good service. Recently, however, the engine goes rrrrr, rrrrr, rrrr at all speeds, instead of running steadily. Any idea what might cause this? It seems to have sufficient power, but it's annoying, and I'm concerned it might be an indication of something worse about to happen.

 

[BlazNT]

Clean the carb and replace all gas with fresh gas. Change gas in gas can too.