1968dave

1998 f150 4.2 177k miles. I have been posting here about several codes that I've been having. I have replaced many parts. I'm not getting a code anymore for a cylinder misfire. I replaced the imrc, spark plugs wires, spark plugs and many more parts. I have no more vacuum leaks. Truck seems to be running fine for the last few days the only code that keeps coming up is p0174. Any suggestions on what I should check?

BareBonesXL

Look at freeze frame data and see if the engine is cold or warm when the code sets. See if P0171 is pending. Check the fuel trims when the engine is warmed up. Those will be clues.

1968dave

I will check them. I do know that first time I cleared them and code came back on after coolant temp hit 190f.