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i have a 1980's vintage 3 HP brigss that has started to act up...it starts and mows fine for maybe 30 minutes then starts to throttle up and down then shuts off...it will start right back up again but then does the same thing...what could be going on?...i checked almost everything i know to check all seems ok...any ideas ? thanks
 

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Kind of sounds like fuel starvation. Maybe some dirt floating around in the tank or don't over look an obstructed tank vent.
 
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