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I have both p0172 and p0175 (both banks running rich) and I cannot seam to diagnose the problems. My fuel injectors I haven’t checked but I don’t see how all or most of them could be bad. Another problem is that sometimes when I shut it off it will sound like it’s starting and then stall and the truck shakes violently as if the driveshaft is still spinning. I do know that both cats are bad but I’ve had those codes for a while and this just recently started. Can anyone give me some help in trying to figure out what’s wrong with it.
2014 Silverado 5.3L Ecotec 6l80
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