99 K2500 7.4L Truck lacks power when put under load and has several lean condition codes. Truck also won't shift into other gears. Just stays in drive (I do have reverse). Fuel pressure is 52 at 2000 rpm. The truck will rev up to 4-5K RPM's in Park and Neutral, but will not go above 2200 RPM's when driving.
CODES
P0131
P0137
P0151
P0157
P0171
P0174
I replaced the fuel filter and no change. I also unhooked the battery and left off overnight to reset codes and possible limp mode. No change, but codes are now gone. What would keep me from shifting into 1, 2, and 3rd gear, but would let me drive in D and R? There is also still a small misfire at idle.
CODES
P0131
P0137
P0151
P0157
P0171
P0174
I replaced the fuel filter and no change. I also unhooked the battery and left off overnight to reset codes and possible limp mode. No change, but codes are now gone. What would keep me from shifting into 1, 2, and 3rd gear, but would let me drive in D and R? There is also still a small misfire at idle.