question on P0103 code

My 1996 blazer has been running poor lately and my mileage is falling. I had a tune-up last year, changed the fuel pump last month and replaced the ignition module 3 weekd ago. My CEL came on and I pulled the codes and got the following

P0103 - I looked it up and it's Mass or Volume Air Flow Circuit High Input

What does this code mean and what should I do about it?



P1870 - I looked it up and it's Transmission Component Slipping

What does this code mean and what should I do about it?

thanks for any help

P0103
The Mass Air Flow (MAF) sensor measures the amount of air entering the engine during a given time. The VCM uses the Mass Air Flow information for the fuel delivery calculations. A large quantity of air entering the engine indicates an acceleration or a high load situation, while a small quantity of air indicates a deceleration or a idle situation.

The MAF sensor produces a frequency signal which a scan tool can monitor. The frequency varies within a range of around 5 to 7 g/s at idle to near 125 g/s at maximum engine load. This DTC is a type A DTC.

Conditions for Setting the DTC
Power Up Test
The engine is off.
The ignition is ON for 0.7 seconds.
The MAF is at least 300 g/s.
High Frequency Test
The engine is running.
Engine Run Time is at least 2 seconds.
System voltage is at least 10 volts.
Throttle Position is less than 89.8%.
The MAF sensor is at least 300 g/s.
Above conditions present for 2 seconds.
Action Taken When the DTC Sets
The VCM illuminates the Malfunction Indicator Lamp (MIL) the first time the fault is detected.
The VCM calculates an airflow value based on the Idle Air Control (IAC) valve position, the throttle position, the engine speed, and the barometric pressure.
The VCM stores any conditions which were present when the DTC set as the Freeze Frame and the Fail Records data.
P1870
The VCM monitors the difference between engine speed and transmission output speed. In D3 drive range with the TCC engaged, the engine speed should closely match the transmission output speed. In D4 drive range, with the TCC engaged, the TCC slip speed should be -20 to +20 RPM.

When the VCM detects excessive TCC slip when the TCC should be engaged, then DTC P1870 sets. DTC P1870 is a type A DTC.

Conditions for Setting the DTC
The following conditions are met for three TCC cycles with reported excessive TCC slip conditions.

No TP DTCs P0122 or P0123
No VSS Assy. DTC P0502
No TFT Sensor DTCs P0712 or P0713
No 1-2 SS Valve DTCs P0751 or P0753
No 2-3 SS Valve DTCs P0756 or P0758
No TFP Val. Position Sw. DTC P1810
No TCC PWM Sol. Valve DTC P1860
No TCC Sol. Valve DTC P1864
The engine speed is greater than 400 RPM for 8 seconds.
Not in fuel cutoff
The engine torque is 50-450 lb ft.
The gear range is D4.
Not in 1st gear
The TP angle is 9-35%.
The TFT is 20-130°C (68-266°F).
The TCC is ON for 5 seconds.
The TCC is at maximum apply for 5 seconds.
The TCC slip speed is greater than 130 RPM.
All conditions met for 7 seconds
Action Taken When the DTC Sets
The VCM inhibits TCC engagement.
The VCM commands maximum line pressure.
The VCM inhibits 4th gear if the transmission is in hot mode.
The VCM freezes shift adapts from being updated.
The VCM illuminates the Malfunction Indicator Lamp (MIL).