i please the engine is not running good and if you accelerate the engine is not accelerate and the code is p0171
Bank 1 system to lean. I would suspect a vacuum leak. Check under the hood for a disconnected or cracked vacuum line.
If your code is PO171 or PO174 then there is a fuel delivery issue, If your fuel filter hasn't been replaced yet then do that first before replacing the fuel pump[The volume of sending fuel is insufficient]
po343 is camshaft sensor 1 bad and po171 is bank1 sensor bad, in English po343 cam sensor is mounted on back of engine and hard to get to, the po171 is bank 1 o2 sensor easy to replace.
System to lean (bank 1). There is a good chance you have a vacuum leak under the hood.
P0171, system too lean (bank 1). P0174, system too lean (bank 2). Start with checking for a vacuum leak.
leaking intake gaskets...
PO171 = system adaptive fuel too lean (bank 1) PO174 = system adaptive fuel too lean (bank 2)
system to lean bank one 02 sensor ?
po171--- system to lean (bank # 1)
P0171 System too Lean (Bank 1)
Fuel injection system, fuel trim to lean (bank 1)
Trouble code P0171 Means: System too lean (bank 1)
Code P0171 means System to lean (bank 1)
Check your EGR valve or see if there are any vacuum leaks. Other than that, no special ideas.