Yamaha 30 dropping cylinder

[Growler Marine]

Hi guys,

I have a 1999 30hp 3 cylinder 2 stroke.
It starts on only 2 cylinders and picks up the third around 2000 RPM. Over 2000 it runs strong and sounds great. It will drop the cylinder coming back down as well. Around 1800 the cylinder starts firing but there is a frequent misfire.

Any thoughts on this?

Thanks.

 

[vroomZOOM]

sounds like the coil is toast or the carbs arent synced