06 LBZ, replaced high pressure pump w/Bosch factory reman unit due to code 87 (low fuel rail pressure). Confirmed low fuel rail pressure and pump as fault. Truck runs excellent until driven approximately 2 miles, sets no DTC's and all components show to be operating within their desired range. Fuel rail pressure is now as designed. Truck also will not start without a small shot of either. Once running, the engine runs perfectly and is capable off 3500 + rpm. I have checked all other computers and there are no other trouble codes anywhere in any other system, HELP

 

Do u mean a 2000 rpm safe mode?