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Hello,My 2006 taurus has been running rough at idle now for about 30 to 34k miles,and my question is why are there no codes or cel?With all of the sensors i would think it should have set at least one.Ive tried everything to find a vac leak,but cant come up with any.the dealer here is no help at all,they keep replacing parts that i dont need,any advice? thanks
 

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Have you looked at fuel trims on each bank to see if they are significantly different?
 
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