protetype - Thanks for the added info! I'm another short mofo, which was why I was having such a hard time seeing the stupid thing....

litnin - The Haynes manual doesn't give separate specs for with the hose attached or not, just 42-55 PSI for 1996 and up (it does show different specs for having the vacuum hose attached or not for 1995 and back, though). That was all I had to refer to, so that's what I was going by. If you have a manual that shows otherwise, please let me know - I really want to figure this thing out.

The fuel filter was replaced about a month ago - PSI was unchanged. EGR valve was replaced less than a year ago when the dealer first started trying to diagnose this problem. $300, didn't make any difference.....