GCV 160 5.5hp motor won't idle - surging
i have a GCV 160 5.5 hp honda motor on a trimmer mower. Recently it won't idle and surges at low speeds; but when under a load it runs great (full power).
I just finished cleaning the carb. I took it apart and blew it out with air (I didn't have a carb kit). It still does the same thing.
Is it possible something else is causing this, or is putting in a new carb kit and soaking the dirt out the only option?
Would appreciate any advice from your experiences.