I've been having issues with my mower idling below high for a little while and occasional taking a while to start. I've changed the oil, oil filter, fuel filter, spark plugs, and new gas (had to keep in choke to keep mower on). After some tinkering around I found that if I hold up the lever in in the below images it'll stay running and will idle even in low. In the images I have a small piece of card board propping up the lever. I'm a little out of my element here and am not sure what part it is or how it ties in. Any advice would be greatly appreciated.
View attachment 39554
Picture is nice.
Now, tell mechanics what engine brand and model you have.
sounds like a dirty carb to me....