Maytag performance pyg2300aww is making a screaching sound

you could have a bad, thermostat ,, its sending a signal to cut off the heat to soon, also, be sure and check the vents to make sure they are free of any build up or debris

The problem must be in the igniter then if you replaced the coils. Here is a link to the part you need.
http://www.appliancepartspros.com/part_details.aspx?part_id=4038992

That's easy, first of all you must have the Dryer on flat floor I mean verticly right. And try not to put too many clothes to get dried.

http://www.maytag.com/content.jsp?name=troubleshoot_dryers_general above is a troubleshooting site, below, is a service manual download for your dryer. http://appliancejunk.com/forums/index.php?topic=2946.0
I think you may find that one of your elements has gone faulty, Just use the troubleshooting and you should be ok

Try this free video www.appliancehelponline.com/servicemanual.html

Check for bones/glass/ceramic from chipped plates in the food chopper (for lack of a better term). You'll need to disassemble the entire lower arm unit.

If you have the model number you posted under, you are looking at replacing the evaporator fan motor, which would be a part number 4309014 for that Maytag MQU1556A. It is located inside the freezer, behind the lower back wall.

If it was your blower wheel it would not make that noise first cheak and see if thewheel has play on the shaft if so then it will need to be replace second turn blower wheel by hand back and forht if there is a screaching sounds if is a dry bearing on the motor .If so if you can live with the sound it will not go right away if not remove motor and replace.If there is play on the wheel you will need clip pliers and normal pliers and remove both clip[ on shaft and clip on shaft revers after install new blower wheel good luck:)

If it acts that bad, I would try to find me a new dryer.

When I turn the dryer on it hums and the motor doesn't turn. Is there a capacitor on the motor that might not be starting the motor