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			#10  
			
			
			
			
			
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			Thanks, Lee,  I also suspect that my o2 sensor could be failing. First I want to use a half tank of gas to see whether the new plugs and airfilter change brings any improvements in fuel consumption, then I will try replacing the o2 sensor. Wouldn't a failing crankshaft-position sensor cause hectic/rough idle too? | 
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