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Discussion Starter #1 (Edited)
Had a timing chain put on our 07 cobalt, now it's got a bad miss, he put new Autolite spark plugs in it, has a p0300 code, multiple misfire, any ideas?
 

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Did the timing chain jump prior to changing it? And these cars don't run well with anything other than ACDelco dual iridium.
 

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If it jumped more than 2 teeth chances are you have a bent valve, check compression.
 
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