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Puff of blue smoke at idle

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  • Puff of blue smoke at idle

    Lately my 2000 ox66 would give a puff of blue smoke.
    It only happen when I launch the boat and idle out about 15 second.
    My rpm would drop from 600 rpm to 400 rpm and a puff blue smoke almost stall out. Then I would clear up after a few second . The motor would run fine again.
    I have just change the LP fuel pump and vst filter and water and fuel separator
    And clean o2 sensor a few month ago also new spark plug.
    Anyone experience this or any info regarding to this.
    Thanks
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