motor occilates up and down until stops

My 8-N starts fine then after cutting grass a few min it starts cycling up and down. I have to pull the choke out and wire it to a spot. As the motor is underload..it pulls on the choke bar and I have to continually reset it to get it back up to power?? What is going on and how do I correct it? Right now the choke is out about 1/3 inch. Tomorrow I might have to adjust out to only 1/4 out??thanx!!
 
Sure sounds like a carburetor issue to me. Scroll down through all the posts on here, two or three pages at least until you find a reply by Bruce(VA). He will have a link to his 75 tips. Open that link and print them out. Full of great information.
 

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