CD- Greetings from New Zealand
The question is if you can rev up the engine normally while in neutral. If so the problem is probably just setting the idle up a little.
You want enough RPM's at idle that the engine does not die when shifted into gear, but not so many the gears "clunk" when engaging.
Good luck and let me know how it goes. And thanks for clicking "Accept" so the computer will pay me.
Scott
Marine Engineer
MEC3 and RYA Yachtmaster Ocean