Help Engine Check Light.

I have a 1997 Mercury Mystique 2.0 Liter.

I get to codes P1409
P0171 "system too lean bank 1"

Can u guys help me to c what those codes mean

i just got rebuilting the tranny, new radiator, and colant sensor, 02 sensors.

I would try cleaning your MAF.

i had a new intake put in? what do u mean by MAF?

Mass Air Flow Sensor