Here's another checklist success story: I went throught the list step by step, and it ended up being the salt and pepper shakers. My surging problem had been bugging me for about a year and a half. The cause ended up being the Ford recall jumper harneses. If your car has them, pitch them in the trash. Here's a good link for more info (I don't think it's been posted on this thread):
http://www.fordfuelinjection.com/?p=85
I'd suggest following it just for preventative maintenance.