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I am currently stumped on a Silverado that has a PO171 PO174. I have smoked the intake and found no leaks. New intake gaskets were installed, new bank 1 and bank 2 sensor 1 o2 sensors and new bank 1 sensor 2 o2 sensor which was replaced due to eaten wires by rats. Truck has also had maf replaced with aftermarket that I replaced back with factory due to being a bad reman maf. Will crank and run but after about 15-20 seconds the short term fuel trim will show around 50 while the long term is at 25 and stays there. Fuel pressure is at 63 lbs at idle. Any guidance would be greatly appreciated.
