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You're probably loading up at extended low rpm cruising and fouling the plugs. If you cruise slowly for a long time in 3rd, does the same condition appear? You may be running a bit rich or your initial timing may be off a few degrees. I have experienced similar symptoms and adjusting the mixture and fixing the timing set everything right again.
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Tropical Buzz
Grant me the serenity to accept the things I cannot change, the strength to change the things I can, and the wisdom to know the difference. -(wasn't me)
BEWARE OF THE DOGma!! Dogmatism bites...
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