[Shotimes] OT-trouble codes on a '94 Topaz

[Juillerat, Aaron J]

My '94 Topaz is throwing a couple codes.
157: (R,M) Mass Air Flow signal is/was low or grounded - MAF
212: (M) Ignition TACH signal was erratic (module/wiring) or SPOUT
circuit   fault - Ignition Systems

The car will spit and sputter for a bit when acceleration from a stop or
if you let off the throttle to coast or hit the brakes then go to
accelerate again it sputters for a bit then takes off.  It runs fine
when cruising and idling.

Any ideas what may be causing these codes?  Could it be wiring or a bad
mass air?

Thanks,
A.J.