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Jack,

I would also drain the carbs before you consider anything more invasive. I do not know your engine well, but I suspect there are brass drains toward the bottom of the carbs. Could be water or junk sitting in there...:o

I have had good results with seafoam... But... I would also be careful when mixing additives. Star tron primary removes moisture, seafoam also does that as well as cleans but may not have compatible chemicals.

good luck