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I think someone missed a 0 in their post then eh
 

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read the article in the link. it says that any 2007 cobalt spark plug must be changed at 2000 miles, and if you drive a lot, every 10000 miles. but thats crazy. i've never heard that before. just stick w/ the manual. noone here has had any trouble keeping the stock plugs for 100,000 miles. and the cobalt actually comes with really good stock plugs
 

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I had to change mine to a step colder plug, my old ones where wow consider the car had 19K miles. Now this is not for everyones, pretty sure they were like that cause of the mods and everything from the racing I had done. I think I should go back in and regap though, car seems to idle(need doesn move though) rough, like feels shaky. Or its the maf being dirty.
 
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