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Hi all, I am new to this forum, but am in need of some help. I have a 2012 GMC Sierra Denali HD. I have had it since new, and have 100K on it now. It is in great condition, and with the price and availability of a new one, I don't want to get rid of it. It has been a great truck, I towed a 5th wheel for the first 6 years and it towed it like it wasnt there. In the last 6 months or so, when I try to pass at highway speeds, it falls flat on it's face, stalls, and has to be restarted. No codes are storing, and I have not been able to pinpoint the reason. I know that there was a post a few years ago by one of the members who had a new 3500 with the same problem, but didnt know if anyone had found the issue. Thanks, Dave
 

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Your either collapsing a fuel line or sucking in a bunch of air in the fuel lines. Tell us a little more about your truck, lift pump or other mods.
 
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