I determined that the screeching was coming from the ribbed idler pulley on the right side of the engine. Replaced that and screeching is gone. I visually inspected the rest of the pulleys in between the rain we're getting and I don't SEE what I would call bad pulleys. The tensioner is moving a little up and down at idle but doesn't look like anything crazy. The pulley on the tensioner appeared to be spinning fine...
After I cleaned the MAF sensor the voltage has not dropped below 13.0 volts at all. Even though the idle is real rough and the voltage is fluctuating between .8 to .4 volts. it's usually between 14.5 to 13.7 lowest sometimes to 13.3....
I can not remove the belt right now and spin the pulleys because of 1.) the rain and 2.) I have stiches in my back right now and the further down I reach I can feel the stiches straining...
When I went to replace the ribbed idler pulley I had the manager at advance look at the belt system and the only concern he had was that the smooth idler I replaced a couple weeks back on the top left side of the engine can spin freely without relieving any tension from the tensioner.
He squeezed the belt while the car was off watching the tensioner move and it didn't seem to have any problems. BUT he did think it was weird that the smooth idler pulley on the top left side could spin freely with the tensioner not being touched....