well, i just changed the MAF after freezing my butt outside with a vomtr. i wasn't getting a reading at all from C-D terminals, so i chose the replace it. There is a difference in driveability it doesn't have shift problems any more, but i'm still seeing black smoke and it stumbles while accelerating on the highway...cat could be recovering from driving it around for a couple months while it ran rich.
Specifically, i've been running the codes using an obd2 scanner and getting P0172 and p0175....the 02 sensors in bank 1 and 2 show "rich".
Now, there isn't a check engine light after resetting the pcm, but i haven't really driven it more than 10 miles so far.
We shall see if i still have the problem. i brought the vehicle and asked them to check the pressure on the rail and they claimed it was high, therefore i changed the rail and fp damper.
IAT has proper resistance.