I found a ICM and coil pack set on ebay. I'll swap 'em in and see if the symptom changes. Otherwise, I'll look real close for vacuum leaks before I go for a PCM swap.
Thanks
Steve

Swapped in a ICM and coil packs. Still have the same problem. It might have gotten better on the highway cruising but it is still very noticable in the 1000-2000 rpm range with light throttle. What next? It seems to be worse when it warms up. Could it be a temp sensor?

Are any of your plug wires touching each other or touching metal? My wires went bad because of that and caused the same problem you are talking about. When its dark out start the car open the hood and rev it up a bit see if you see any sparks coming out of your wires. This is the second time I had that problem and it was due to a bad spark both times. I know your wires are fairly new but they can still good bad quickly.

The SES light finally started coming on intermittently and the stumbling had gotten worse. As I have yet to obtain a reasonably priced scan tool, I took it into a mechanic I know and they scanned it, found an error code that indicated an EGR valve malfunction, took the valve off, cleaned it, put it back together and now it runs GREAT! Just charged me $69 for the diagnostic.

EGR... We'll have to remember that one.

I shouldve known that one, my saturn had the same problem, but I got cheap and just unplugged the vacuum from it

Crap. That didn't even cross my mind. And it should have. Shame on us, Fuddy.