94 T-bird engine stumbling

Hi all

I have a 94 T-bird V6 with 150K miles.  Recently the check engine
light came on after occasional engine stumbling.  I pulled out the
following codes:

157:  Mass Air Flow signal is/was low or grounded - MAF
158:  MAF sensor is/was high or short to power - MAF
173:  Oxygen sensor not switching - system is or was rich - Single,
Right or Rear HO2S - Fuel control
189:  Fuel system was lean at part throttle - Left or Front HO2S -
Fuel control

After cleaning the MAF, check engine light comes and goes and only
code 157 persists.

I want to know if there is anyone who had a similar problem, and did
changing the MAF sensor get rid of the problem
 

 
Thanks.