I've got a 96 GMC W/7.4L I keep getting a 0102 code as soon as I turn the key on. If I clear the code it comes back on as soon as you turn the key back on. Put a new sensor on. Didn't help. I've got a good ground and power running to the MAF. I've got .255 volts coming out of the sensor. The code is for low voltage or frequency. Any ideas.