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Hello, I'm new to the forums and if this is in the wrong spot, please correct me.


So my 9-3 have been having a misfire under heavy loads, the boost meter won't to into the red section, and no CEL. I've noticed a slightly rough idle as well. I've already changed spark plugs and the valve cover gasket. Next step will probably replacing the coil packs. anyone else had this problem before, or know the solution? thank you!
 

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No, but if u have a scanner that can read mode 6 data, u can look for the misfire data on which cylinder is it actually happening and only replace that coil (OEM coils only) read the thread about the coils
 
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