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		 eh, a totally shot iacv will make it shudder like that without necessarily having an idle issue - mine did at times 
when you say the idle's uncomforable...how so? 
 
I vote for cleaning the inside of the iacv, and also its connectors (plus use of dielectric grease) and then go from there 
		
	
		
		
		
		
		
	
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