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Re: Misfires, retarded ignition timing...
How many degrees of knock retard (KR), if any? Poor gas could cause higher KR which will retard the ignition timing. It was premium gas? It is not unusual to get contaminated gasoline during the winter months so that could be a valid assumption. Water or excessive moisture is common. Try running some Heet additive through the tank. 12 oz per 10 gallons.
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