1992 Mariner 150 firing problem

[Ricky_Boy]

Hello, I have a 1992 Mariner 150. It seems to be firing only on 3 cylinders. I have looked at all the coils and replaced the ones that had cracked magnets. Cleaned the carburetors. I also replaced both of the switchboxes. I do not know what else to test. I was thinking the stator or trigger could be the next culprit but I don't know how to test those. Also the ignition where you put in the key to start the boat sometimes acts up and I need to wiggle some wires up underneath the dash of the drivers seat to get it to start, but when it does it runs boggy like in the video below. Any help would be appreciated.

Here's a video of it running. Copy and paste in the web browser. https://youtu.be/Q9vCLygobmI

 

[Chris1956]

Which 3 cylinders is it running on? 3 Triggers are shared by 2 cylinders each, switchboxes power 3 cylinders each. Stator powers both switchboxes.

Disconnect the killer wires (black/yellow) at the switchboxes, to rule out the ign switch.