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Hey everyone, on a recent road trip my C started missing and the check engine light came on. It ran rough the entire time. I've had this happen before so when we finally got it home I changed all plugs but that didn't fix it. I read codes and they popped up 300 and 305. I changed out the coil on #5 but that hasn't fixed it either. There's 130k on the car. I'm looking for solutions but any help here as to a logical next step or solution would be greatly appreciated. Thanks all, Merry Christmas.
 

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May want to swap a couple of the fuel injectors around and see if the misfire code moves with it. On my Ram I had one leaking by flooding the cylinder and would throw a code when it was hot.
 

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Also switch over the leads to another coil pack, say #5 to #1 and see if the misfire follows to cyliner #1.
 
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