After changing fuel pump 2 days ago on my 97 pontiac gtp. it started idling high (2500rpm) then today after getting code p0102(maf sensor) and codes p0122-p0507-p1441 it died on way home and wont start. is it maf sensor($127)

You can test the MAF before replacing. It may be a problem with the circuit itself or just a fluke from another problem that is connected to this sensor.

There are two basic types of mass airflow sensors: hot wire and hot film. In the first type, a very thin wire (about 0.2 mm thick) is used as the heated element.
Components of a hot wire-type mass airflow sensor. Courtesy of Ford Motor Company. The element temperature is set at 100° to 200°C above incoming air temperature. Each time the ignition switch is turned to the off position, the wire is heated to approximately 1,000°C for 1 second to burn off any accumulated dust and contaminants.
The second type uses a nickel foil sensor, which is kept 75°C above ambient air temperatures. It does not require a burn-off period and therefore is potentially longer lasting than the hot wire type.
A faulty MAF will cause driveability problems resulting from incorrect ignition timing and improper air/fuel ratios.
Vane-type MAF Sensors
A vane-type MAF sensor is found on many import and domestic vehicles with EFI. All intake air must flow through the sensor. Some MAF sensors are called volume air flow meters

• Begin checking a vane-type MAF sensor by checking the voltage supply wire and the ground wire to the MAF module before checking the sensor voltage signal.
• Always follow the recommended test procedure in the manufacturer's service manual and use the specifications supplied by the manufacturer.
• Typically, to test the sensor, a digital multimeter (DMM) is used and set on a DC voltage scale. The negative meter lead is connected to ground and the red lead to the MAF signal wire.

• Turn on the ignition switch and press the min/max button, if available, on the DMM.
• Slowly push the MAF vane from the closed to the wide-open position, and allow the vane to safter changing fuel pump 2 days ago on my 97 - f_27.33.gifn to the closed position.

• Observe the maximum and minimum voltage readings as the vane was moved.
• If the minimum voltage signal is zero, there may be an open circuit in the MAF sensor variable resistor.
• When the voltage signal is not within the manufacturer's specifications, replace the sensor.

• Some vehicle manufacturers specify ohmmeter tests for the MAF sensor.
• With the MAF safter changing fuel pump 2 days ago on my 97 - f_32.45.gifed, connect the ohmmeter across the sensor's output and input terminals.

• The resistance at these terminals is normally 200 to 600 ohms.
• Connect the ohmmeter leads to the specified MAF sensor terminals, and move the vane from the fully closed to the fully open position.With each specified meter connection and vane position, the ohmmeter should indicate the specified resistance.

• When the ohmmeter leads are connected to the sensor's input and output terminals, the ohmmeter reading should increase smoothly as the sensor vane is opened and closed.
• To check a vane-type MAF with a lab scope, connect the positive lead to the output signal terminal and the negative scope lead to a good groafter changing fuel pump 2 days ago on my 97 - f_32.47.gif
• This type MAF should display an analog voltage signal when the engine is accelerated. A defective MAF will have sudden and erratic voltage changes.

• To check the MAF sensor's voltage signal and frequency, connect a voltmeter across the MAF voltage signal wire and ground wire.
• Start the engine and observe the voltmeter reading.
• On some MAF sensors, this reading should be 2.5 volts.
• Lightly tap the MAF sensor housing with a screwdriver handle and watch the voltmeter pointer.
• If the pointer fluctuates or the engine misfires, replace the MAF sensor.
• Some MAF sensors have experienced loose internal connections, which cause erratic voltage signals and engine misfiring and surging.
• Set the DMM so that it can read the frequency of DC voltage.
• With it still connected to the signal wire and ground, the meter should read about 30 Hz with the engine idling.
• Now, increase the engine speed, and record the meter reading at various speeds.
• If the MAF sensor frequency reading is erratic, replace the sensor.

• When a scanner is used to diagnose a General Motors' vehicle, one test mode displays grams per second from the MAF sensor. This mode provides an accurate test of the MAF sensor.
• The grams per second reading should be 4 to 7 with the engine idling.
• This reading should gradually increase as the engine speed increases.
• When the engine speed is constant, the grams-per-second reading should remain constant.
• If the grams-per-second reading is erratic at a constant engine speed or if this reading varies when the sensor is tapped lightly, the sensor is defective.
• A MAF sensor fault code may not be presentafter changing fuel pump 2 days ago on my 97 - f_32.49.gifratic grams-per-second reading, but the erratic reading indicates a defective sensor.
• Frequency-varying types of MAF sensors can be tested with a lab scope.
• The waveform should appear as a series of square waves.

When the engine speed and intake air flow increases, the frequency of the MAF sensor signals should increase smoothly and proportionately to the change in engine speed.
• If the MAF or connafter changing fuel pump 2 days ago on my 97 - 00375_maf_burn_off_module.jpge trace will show an erratic change in frequency.

If you have a scan tool or know someone that does check what the temperature sensor is reading. It sounds like the sensor is registering cold making the computer dump gas into the injectors causing the engine to flood. You can test the theory by pushing the gas all the way to the floor and holding while trying to start the vehicle. If it does start then the problem is most likely the sensor it is mounted on the top front of the engine most likely and only costs about $12.

The p0122 is for the throttle position sensor, p0507 is for the vehicle speed sensor, and 1441 is for the evap system. first check all your connections looks like you dont have everything plugged in correctly. as for the evap code i would check all your hose connections on the gas tank and fuel filler neck