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So I am having an issue here that i cannot figure out. I just recently have been having this issue where run out 3rd gear and when i shift to 4th my rail pressure will only hit 17k psi but will pull 27k psi at WOT. if i roll into the throttle and hesitate on shifts i have no issues and will pull 27k all day long. I capped the rail, added a fleece lift pump. the truck also is tuned via efi live. i have done various data logs and the tuner says the tuning is good and my commanded rail pressure is in check and my fca is functioning properly.
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2011 6.7/g56. efi live, fleece lift pump, s369, hamilton spring and pushrods, arp 625s. sb3250
 
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