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Challenger 1997 stalls when idling/low speed

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Wheel02

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Hi Guys! I'm new here.
I bought a challenger 1997 15', few weeks ago.

It has a new engine or just rebuilt, new turbin, new MPEM.
On water on medium/ high speed, it runs perfectly.
But with the lever on idle, it dies. You can see in the video:


I tried to play with the ridle screw, but it did nothing.
What should I do ?

Thanks :)
 
when were the carbs last rebuilt? has the boat sat for some time without being run? have you done a compression check? (irrelevant that it was just rebuilt- check it anyway) do you have a service manual? if so, have you adjusted the throttle cables according to the procedure?

you should have about 3k (3.2 perhaps?) rpm idle out of the water and somewhere around half that with the boat in the lake.
 
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