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why does my lawn mower engine start fine but quickly stutter and die, even with plenty of gas in the tank?

I own a Sears Craftsman 3.5 hp 20" rotary mower, Model #917.380310.
Mower starts up and runs fine for awhile, but then starts to sputter and will die. If I hit the choke balloon a few times it'll start right up again, run for a few minutes -- and die.
Hoping it was something easy, I pulled the spark plug, cleaned and gapped it and replaced it, but the problem persists.
I'm thinking maybe a clogged fuel line?
Mower's got plenty of gas.

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Craftsman , Lawn Mowers
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3 Answers from these members:
Manage My Life
by Manage My Life
June 1st, 2010
Answered in 21 hours
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Joey S
by Joey S Earned 8,568 community points in Craftsman
June 2nd, 2010
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Manage My Life
by Manage My Life
June 2nd, 2010
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