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Discussion Starter · #1 · (Edited by Moderator)
I recently bought a 2011 GMC Acadia155,000 miles on it, it was driving fine for a couple months and then the engine light came on. I hooked it up to the scanner and it gave me 305 engine misfire cylinder 5. So I started by changing the spark plug, then did a 6 at the same time. This did not fix the problem. It was driving a little better I am still getting the same code. So I replaced the coil on cylinder 5 and this is when everything went to crap. Now I’m getting multiple codes and misfires and I have no idea why. Any insight would be amazing. Thank you in advance.
 

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After market coils have known to be not the greatest. Or possibly a wiring harness issue sinceit got worse after replacing coils. Check wire harnesses and connectors (bent or damaged pins) that may be affected.
 
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