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  1. B

    Unusual Coolant Problem

    How often do you need to refill the reservoir?
  2. B

    1998 Tahoe 5.7 P0401

    Getting code P0401. The EGR valve is good and the EGR tobe is good. Next step is to clean out the EGR passage going to the intake manifold. Can I do this without removing the upper manifold?