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Is the motor a 86 or a 96?
Would you please post the serial number of the engine?
The first thing that you will want to do is a compression test. Make sure tht both cylinders ore over 90 PSI. If not, the engine will not run good at all. After that, if the bottom plug is cleaner, white, than the top plug, you have water getting into the cylinder. There are two places that this can happen, the exhaust plate or the powerhead gasket. Stat by replacing the exhaust plate gaskets, try the engine. If it is still doing the same thing, replace the powerhead gasket.
If you have any questions, please let me know.
No, if you do not have spark and you have already replaced the stator and the trigger, the switchbox is bad.