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I have a 1998 Johnson Venom 200 hp motor. When you run it on muffs it runs just fine. The minute we back it into the water it starts spitting and dies out. It runs fine once you get under way/high rpm’s. But won’t idle it starts spitting and sputtering and dies out. 

Any ideas 

Edited by Ropiela

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On 11/25/2017 at 6:52 PM, Ropiela said:

I have a 1998 Johnson Venom 200 hp motor. When you run it on muffs it runs just fine. The minute we back it into the water it starts spitting and dies out. It runs fine once you get under way/high rpm’s. But won’t idle it starts spitting and sputtering and dies out. 

Any ideas 

Id check for any gas leaks or seals.  I had an issue one time on a little 15hp motor where it would do the same.  Fire up fine at home and spit and sput around.  Turned out to be a seal on the vacuum driven gas pump seeping air into the line causing it to not get enough fuel unless it was under running RPMs etc.

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Might try replacing the Primer bulb if the boat is equipt with one. I have had that same issue a couple times and new bulb fixed it about every time.

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