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2000 Mazda 626 Question: what causes the idle to go up and down on a regular basis,

 

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davidrogers1482, 2.5L V6, Winston Salem, NC, December 28, 2011, 12:00
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I was told that egr is causes that,Ijust had fuel injection cleaned,tune up,just can't get idle to stop variating.also still have egr code,should I replace it?

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