I had an old Kawasaki jet ski that would do that when being flushed on the trailer with no load.  I had to cut the fuel to get the dang thing to quit.  It would idle up pretty high and pretty much scare the crap out of anyone nearby.
		 
		
		
		
		
		
		
			
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				1985 Wellcraft V-20, Evinrude ETEC 150: SOLD 
1979 Marine Trader 44, twin Ford Lehman 120s 
2006 Panga 14, Tohatsu 20
			 
		
		
		
		
		
	
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