What a pain in the keister: Here is a test for you!

[alblogg]

I think I have to go with fuel pump too.

[merc81]

An update...
Yesterday the car won't start when I tried to go to work. Fuel pump failed. This only happens when you fill the tank (somebody explain that to me) and have 16 gallons or so of fuel to deal with when pulling the tank out. Oh yea, GM really played nice with the fuel lines on the top of the tank too. No play at all in the lines and there is no room to get tools up there and unscrew the fittings with the tank in the way. Took me all day and I ended up breaking off the return line connection trying to unscrew the fitting.
Sigh..

Car works better now, but still has some unsteady idle; its not as bad, but not like it should be. I'll pull the plenum this weekend and see how it looks in there.