How to fix reduced engine power mode on GMC and Chevy / Throttle body cleaning on 2010 GMC Terrain 

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I have seen multiple forums asking about how to fix reduced engine power in Chevy and GMC vehicles with scattered responses. I have now had reduced engine power with service stabilitrak system warnings in my 2011 GMC Sierra and 2010 GMC Terrain which were resolved simply by cleaning the throttle body. This project costs only about $15 and takes about 15 minutes. I hope this helps everyone with this problem.