2012 GMC Sierra Rough Idle Fix – After a little troubleshooting, I was able to get the GMC Sierra 6.2l Fixed this week. About a week ago the engine started acting up making all kinds of noise while driving home from dinner. The sounds being similar to cylinders that are not firing at the right time. Diagnostics showed a few engine codes with the first being the Camshaft positioning sensor. I was able to replace that along with a few other parts – reset the system and now good to go.
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