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Hello. My name is Tan.
The switch he is referring to is the shift interrupt switch. Yes it should stay in the groove. When it comes out of the grove it will cut cylinders. Disconnect the switch and see if it misses when in gear now? If no misfire then either the shift cable to the drive is going bad or the control cable is bad. You will have to shut the motor off to get it out of gear with that switch disconnected.
Post back with finding when you disconnect the switch?
It is possible. But we need to verify the switch is actually the problem.
Let me know what you find.
Does it misfire now on the muffs? If no then it has to be in the water under a load.