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injector rates

  1. 01-04.5 LB7 Duramax Powertrain
    my balance rates are all within spec but truck is hard starting and has like a fuel knock to it. no fuel leaks and vacuum is within spec. should i have the dealer do the manual injector return test? also pump will run up to the 23,000 psi or whatever its suppose to be. tests were done on tech 2...