have them check the lift pump,fuel pump and fuel lines.p.s. just a thought if the fuel isn't getting to your fuel rail fast enough it wouldn't have enough fuel rail pressure
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05 lly dually mods,the mirrors off my 06 2500HD,programmer ppe hot soon to be upgraded to the hot e.t. 2

,ppe boost controller,S&B air intake,dual 4" siverline turbo back exhuast with 5" tip no cats,bully dog shift kit soon to be upgraded to stage v sun coast transmission with triple disc torque converter$$

,wish list

twin turbos,dual cp3 fueler,bigger injecters,and so on$$$$