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fuel rail pressure to low

  1. How Is my Fuel Rail Pressure still to low?

    06-07 LBZ & LLY Duramax Powertrain
    If im on the highway and lay into it when she shifts into 6th at WOT i throw the p00087 i think is the code( the fuel rail pressure one that i have seen way to many times) First i put in the PPE race valve (says will eliminate the code) so then i put on the airdog II (figured still not getting...