Well, I went ahead and ordered the Delphi fuel pump, should be here to install this weekend, I'll post with the results.
As for the stumble, the scenario when I can make it happen everytime is getting on the highway, giving a lot of gas on an on-ramp. I will accelerate to about 70, and then the stumble starts to occur. I usually have to get off the gas until I can feel the engine 'catch-up' which will drop the speed down to about 60, then its good to go. Well, good to go until the next time I have to accelerate again, like up a decent hill. You can get it to go away with a hard acceleration during the stumble.
Pressures looked off, so I went with the fuel pump, the spider and regulator were replaced last weekend, so this is the next step.
Any tricks to changing out the fuel pump, or is it pretty straight forward from dropping the tank? Am I going to need a fuel line disconnect tool, or will my ford one work?