Hello, I new here. I’m having an issue with my 6 year old Craftsman push lawn mower with a 190 cc Briggs & Stratton. It all started about 3 months ago when my mower wouldn’t start anymore. I rebuilt the carburetor, changed the spark plug & air filter and all was fine till last week. It still starts fine, but now dies after a few minutes of mowing. After about 10 minutes it starts again and repeats the process. When it dies, I noticed the carburetor throttle blade is wide open. When it cools down, it closes and re-starts again. I think the issue may have something to do with the auto choke system. What do you guys think?...any suggestions?