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.