Be sure the linkages are all lubed be fore turning screws.  Sometimes a cable will get a slight twist in it causing this too.  Could it be idleing high until it warms up to operating temp?
		 
		
		
		
		
		
		
			
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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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