Originally Posted by
WVVan
Everything was just fine until I noticed the check engine light. Checked the code numbers. They were P0171 and P0174. Cleared the codes to see if they would come back. They did.
continued
P0171 = Cylinder Bank #1 Lean
P0174 = Cylinder Bank #2 Lean
centralized vacuum leak that's affecting both cylinder banks..
always take the vehicle for a shakedown cruise before any long journeys to uncover any potential issues, i always expect the unexpected especially after a motor swap, there's just too many things that can and usually do go wrong..