Allow me to suggest thoroughly cleaning both the carburetor AND the fuel pump, too.
Then change the fuel lines to Silverado 4000 Ethanol resistant types.
Use ethanol-free gasoline, if available.
If you must use gasahol, your fuel, if fresh, will not undergo phase separation for 5 - 8 weeks. With Startron or marine Stabil, this is extended to 24-30 weeks, and happens at a much slower rate.
If you just change the gas, and spray out the jets, you've left out the portions of the contaminated fuel delivery system in between.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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