I cannot find any info on the given model number.
The 363. does tell me it is actually a GE unit.
Most GE's use the same pump and some also use a separate drain pump.

I am assuming you do not have a separate drain pump.

[COLOR="Blue"]I have a dishwasher that seems to drain just fine on some days and not drain at all on others..what's up with this?[/COLOR]
Does it drain out any water?
They usually fill to just under the heating element.
If it does not drain at all during the cycle, it should not fill at all after the second fill as this would have tripped the overflow float/switch which disconnects the water valve.
These units usually leave about a 1/4 inch of water above the sump. The pumps do not like to run when dry, they will burn out the seals.

[COLOR="Blue"]I have checked the drain flow and it's clear and I can watch it drain nicely right into the garbage disposal....this unit does not have a breather on it.....could this be part of the issue?[/COLOR]
Probably not as long as the drain hose is looped up about 12 to 18 inches above where it enters the house plumbing. All the breather (air gap) does is stop the it from siphoning water back into the unit from the house plumbing.

The way your drain works is that the pump has a solenoid (left hand side of pump assembly), at the start of a drain cycle this solenoid is pulled down. It moves a flapper valve in the pump, from the wash to the drain position. The water is then directed out the drain instead of up to the wash arms. Note that it is only activated for about 10 seconds and then the water pressure holds the flapper in the drain position till the unit is empty. The spring then pulls the solenoid back up to the wash position.

Remove the kick plate and manually move the solenoid arm/plunger to see if it is free. Sometimes the timer contacts for the solenoid can stick closed, this powers the solenoid for more than 10 seconds. It overheats and melts the inside plastic so the solenoid starts sticking.

Remove the sump cover (center, bottom of tub) and check the sump for debris and that there is nothing wrapped around the chopper. Take note how the inside piece is installed, put it back wrong and the chopper will eat it. Also be careful there is often broken glass in the sump.

Some units have what is called a Piston & Nut, this is if your unit has a filter screen at the back/bottom of the tub. This should close when in drain or some water is directed back into the tub instead of out the drain. Remove the rear filter/cover and check the Piston & Nut. It unscrews. Normally though when it fails the unit still pumps out some of the water.