I have a code p0171,lean running bank 1

when I unplug my MAF the car stays on idle,as soon as I plug it back the car stalls
could it be a sign that the MAF sensor is bad,thus the cause of my CEL

 

Yes ! It is bad MAF (I think)
http://www.obd-codes.com/p0171

 

any more input,anyone

 

Possible any bad vacuum leaks?

 

I sprayed all over no change,I check the vacuum hoses,they all seems fine and connected.

 

Could be a mass flow.

 

A mass air flow sensor is used to find out the mass of air entering a fuel-injected engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature and altitude, and this is an ideal application for a mass sensor. (See stoichiometry and ideal gas law.)

There are two common types of mass airflow sensors in usage on gasoline engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with an additional sensor or two, the engine's air mass flow rate can be accurately determined.

Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0 - 5.0 volt or a PWM signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings.