Chrysler 280 inboard engine backfiring 1971 whitcraft. Help!

by Cully

Bought a 1971 Whitcraft with Chrysler 280 inboard engines. After a couple of hours upriver started backfiring . Docked and got help from a guy familiar with Chrysler engines who recommended getting Sea Foam to clean the gas. Ran two hours much more cleanly with a better idle after new gas and sea foam . Now, two hours later after idling during the lock and dam, came out and she started back firing again (although not as loud or often). Turned it off and are pushing up stream with the port engine. The question is- anyone experience this engine backfiring and if so what helped? Heidi and Cully

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