Multiple Codes

[53burb]

Everybody,
Thanks to truckdude239, my obd connecting port works now. So here are the codes that showed up:
171 - System too lean (twice - both banks)
174 - System too lean (twice - both banks)
131 - Circuit Low Voltage
137 - Circuit Low Voltage
151 - Circuit Low Voltage
157 - Circuit Low Voltage
101 - Mass or Volume Airflow circuit range/performance
442 - Evaporative emissions system leak

This is on a NBS '99 Silverado 4wd, 4.3v6, 5-sp manual & 120,000 miles.
The "check engine" light comes up intermittenly.
The engine runs fine EXCEPT when it is cold. It seams to run kinda lean for the first mile when it is cold.

Thanks for any help.
Chris