Sounds like the Idle jets arn't adjusted correctly. If you have to start with Spray then you have no Fuel.
But after it starts and you can throttle away from the dock and run at high speeds then your off the idle circuit and onto the main jets.

I would start but adjusting the Idle mixture screws.

Also get a spray bottle with Gas, when you start to idle ruff, hit it with the Spay and if the idle smooths right out then you have an idle adjustment issue.