[Mastroogway]

I've been having an intermittent misfire in cylinder 2. I changed my spark plug, didn't fix it. Then I changed my coils, still would get the misfires. It's doesn't happen ever day it which makes me think it's electrical but I'm not sure. I added some fuel injector cleaner in my tank to see if that helps, if not, then I'm going to pull the injector in cylinder 2. Need help. Thank you

 

[Mastroogway]

I replaced all 4 coils and still misfire in #2

 

[Mastroogway]

I cleared the code after I changed spark plugs and once again after I changed the coils. I bought the duramax plugs from auto zone. I'm going to inspect the harness this weekend and see if theres anything that could be causing it to ground. I'll probably put the original coils back on as well.