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Check engine light is on

(1999 Ford Expedition)
in Fresno, CA on January 20, 2011
why is it pulling when we drive and there is a clicking sound under the hood we just replaced spark plugs and a vacume leak?
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Popular Answer
on January 20, 2011
Basically, you need to have a diagnosis done to find out why the check engine light is on. Not entirely sure what the click noise is... Just know you need more clues, and pulling codes/etc will help.
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