With nothing more than this to add to your post, I hope you don't take it the wrong way.
How old are your plugs, and
WHY ARE YOU USING +4's????
I'm not the least bit upset, or anything, I just didn't know if you hadn't read about how badly they perform in this system, or if you didn't particularly care.
Seriously, though:
Welcome to CEG.
Read through our "archives" and also through our current posts. Learn to use the search feature, and read all the faq's and how-tos. I applaud you for a VERY WELL writte first post, and encourage all others to strive to make their contributions to CEG in such a manner.
I would consider changing to Autolite APP764 Double Platinum plugs (2.99 at Autozone), gapping to 0.054 (pre-gapped is balogna!!!). EGR vacuum test is simple enough to perform, as well, though *should* provide little to no insight in this problem..
The Ford Factory CD references the CKP(crankshaft Position) and CMP (Camshaft Position) sensors when stumbling or bucking on acceleration, as well..)
Ray
