Sounds to me like you have a fuel delivery problem. Since you say you have spark and she was running fine before it quit.
I'd first check my fuel to make sure I was getting fuel and not water to my engine. Older fuel, especially with this Ethanol crap we get now, is very likely during the winter to trap water and separate it out. Suck that stratified water stuff through your lines and your engine will stop in a heartbeat.
If your fuel is ok, then I'd check my lines to make sure i was getting fuel to the engine.
Yes - Check and clean the carbs.
No - Check your fuel filter, your fuel lines and your fuel pump.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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