Surging is usually caused by a dirty air filter, probably best to rip that off first.
Then again, who am I talking to, you own like 20 frigging mowers
Then again, again, most of them have been on fire, so maybe u need to rethink your maintenance strategies
First thing I did was remove his air filter, and they were burned by previous owners.
But yeah, 2 tractors at the lake, a few scattered around the rental properties, 3 in the garage next door, 2 in mine, not including push mowers.