My '88 has been having idle problems lately and when I checked the codes it gave me Code 44 and Code 32.

Where should I start to fix these issues?

My problems were fixed by changing the Oxygen sensor. Idles low and steady now.

Sounds like EGR valve is stuck open.
It should only open past 1500 rpm, remove valve, pintle should be closed.
Does the engine smooth out past 1500rpm??
O2 sensors very common past 100,000 miles also.