here are the codes and what they found, is this a common thing on this
again truck is a 2004 gmc sierra 1599 4x4 w/5.3
P0171 P0174 P0300
also found PIP#3232A
what are these codes?
also they said cracked upper manifold.
they said something it was plastic and air cooled, is this true?
thanks for the advise and info