Silver62

Hope you find out what it is. Mine is doing the same thing 12 Sierra with 6.2 73k miles but mine also has a weird idle. It’s not like a miss but more of a stubble and you can feel it every few seconds while sitting idle. Does yours idle fine? I’ve taken mine to the dealer and described the problems I’m having and they hooked up the tech 2 and told me everything looks fine and the 6.2s just have a bad idle which i don’t think is the answer to my problem