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Just to update my situation..... I pulled the aftermarket tunes and restored the factory tunes. Performed an injector leakdown @ the fuel rail, no pressure loss. Ran a scan and all fuel trims are within spec. At 2k miles I'll drain and submit for UOA.

Received a reply back from my tuner today.......... Quote: Hi Ron, I can understand your concern, however fuel changes of that type or not a part of the tune. It is actually not possible for us to alter the fuel mixture any appreciable amount outside of full throttle. The engine operates in...

Thanks for the replies. Yeah, I was leaning towards the tune being to rich. The funny thing is, my mpg's have not changed. 12.5 avg., before and after tune, odd. I'm thinking of going the Blackstone recommended 2000 mile OCI and retest to see if the test was an anomaly. Then return to stock...

Back story..... 2011 GMC Sierra 2500HD 6.0 gas. 8/2011 Purchased the truck new. 10/2011 Changed out the factory fill and replaced with M1 @ 2122 miles. 9/2012 OC @ 9350m. with PP 7/2013 OC @ 14851m. with PP 8/2014 OC @ 21672m. with PP mods are Black Bear 89 tune and Corsa catback. With...