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Craftsman 917.377061 lawn mower hesitates?

I have the above Sears lawn mower, starts great when cold, after it warms up the engine will hesitate, and act like in is going to stop, then it will take off and be fine. I have replaced the air filter, removed the carb and cleaned it with carb cleaner,
drained the gas. Still acts the same. Any suggestions?
Steve, June 2013
change sparkplug and tighten ht lead

HVCoil, June 2013
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