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Installed Pacesetter longtubes and ran true duals on my 2017 Sierra 5.3 today. I did not install my rear oxygen sensors because I assumed that it would run fine off of the front sensors like every other vehicle i have. I did not get it tuned yet but before I even got home from the garage the truck is running like shit And throwing a code for cyl 7 misfire, along with all the codes that come with the rear o2’s being unhooked. Can anyone tell me if these are related , or is it just coincidence that it happened right after? Truck has 27 thousand km’s. Thanks in advance.
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- cyl 7 misfire
- longtubes
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