I went and got my car checked with a scan tool today and these are the codes I got:

P0171- Sytem too lean, left bank on 4 sensor systems

P0174- System too lean, right bank

I know it could possibly be the MAF sensor, MAP sensor, or the O2 sensors.

Can anyone help me out here?

 

or it could be a vacuum leak somewhere. Check your vacuum hoses and make sure the intake elbow is on correct. Also check the hose to the air pump.

 

Leaks in the exhaust before the O2 sensors and misfires can cause a "false" lean condition. Low fuel pressure, faulty MAF, large vacuum leaks, a hole in the inlet bellows will all cause a lean condition.

 

Try to get ahold of a fuel pressure gauge, make sure it's getting enough fuel first. Best to find out if it's false or not, just in case it really is lean.

 

I have a problem with a whistling, kinda screaming sound that occurs when you start the car and quites down as the car reaches running temp. Can these two things be related?

 

That sound could be a vacuum leak. Raise the hood and see if you can pinpoint where it's coming from.