Chrysler 280 inboard on whitcraft houseboat backfiring

by Cully
(MN)

Chysler 280 inboard motors backfiring on 1971 houseboat after purchasing and upriver several hours. Docked and got help from a guy on the dock familiar with Chrysler engines who recommended getting Sea Foam to clean the gas. Ran two hours much more cleanly with a better idle. 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?

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