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engine making a weird put put noise when idling

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on my 99 SS lXI, when idling or going slow, the engine makes a noise that seems different.  Like a put put noise, or like there is a vibration somewhere.  Boat works fine though.  Any ideas?

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@ss1024:  could you provide a few more details, where exactly do you hear the noise, open hatch and see if coming from spark arrestor, can you hear out exhaust, etc.  Sounds from your description like a cylinder miss or non fire.  The description perhaps indicates a bad gasket seal, could be intake/exhaust or even head gasket.

Edited by Woodski
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I dont hear it from the exhaust.  When i open the e gine box, it sounds like its coming from the belt, but the blet looks perfectly good.  It almost sounds like a flaw from the belt

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