90 Force 120 HP will not turn off with switch nor kill switch

[capricuddy92]

So we are getting snow today so I had to winterize the boat last night. Everything was seeming to be going fine, There is about a gallon of gas in the tank with some seafoam and fuel stabilizer in it. I start up and it idles very high over 5000 when on the water 4000 at WOT.

I turn the kjey off, pull the key, and flip the kill switch. IT IS STILL RUNNING!

I have to pull the fuel hose to get it to stop.

I try to start and it wont start again, realize the kill switch is active, so I flip it and it starts right up. Quickly turn the key and it dies. Try this a few times as I fog the engine and every time I turn the key off the engine shuts off as normally.

Does anyone have any ideas what this could be?

 

[alldodge]

Check your ground connections. Guessing there is some corrosion at the main ground point because both key and kill had no effect at first

 

[Tassie 1]

Don't start it if it runs at wot or you'll be picking up bits of blown outboard for a week or out of the next door neighbours kid,

 

[jerryjerry05]

Spray some WD-40 in the key switch.
Unhook the battery.
Turn it on and off and spray again.
Repeat 3-4 times.

 

[8ender]

That sounds to me like it was dieseling which generally means a vacuum leak somewhere. Check your seals.

 

[jerryjerry05]

Never saw a Force dieseling?
Not saying it won't?