Does anyone have any advice on what to do next?
I bought a brand new 5.7 for my 98 GMC k1500. The truck cranks fine. When I take off it stumbles like crazy especially when you first crank it. Doesn't have any problem idling. I notice when I go to put fuel in it, there is a ton of pressure coming from the gas cap. I can never floor it and it responds; there is always hesitation. I got a scan tool and the codes that showed were P0102(mass or volume air flow low circuit low input), P0113(IAT sensor high input), P0140(oxygen sensor circuit no activity bank 1 sensor 2), P0160( " " bank 2 sensor 2), P0171(bank 1 system too lean), P0452( evaporative emission system pressure sensor low input)...I have replaced MAF sensor, fuel filter, spider injector kit(fuel pressure regulator included), fuel pump. I noticed my ltftrm1&2 were close to 20 when running)