Ok, I need some help here... My 7.3 has some kinda funk...

On a recent trip from VA to NC (~350mi) the truck started getting a very violent shuddering... It happened about 20 times over a 15 minute period, going about 70mph. It felt as if the fuel was completely cut for about 1/10 second. Felt almost like running over a speed bump at 70mph. The RPM guage staggered, as the engine fought to run. Twice, the engine completely stalled while going highway speeds. Might have been my imagination, but I heard knocking from the engine. It would mostly run fine, then get a spell of this engine sputtering stuff. I bearly made it home. Didn't seem to have any connection with the throttle position, or driving speed. It would really throw you forward as each unexpected jolt happened... I always get my diesel from a respectable dealer, and run that Diesel Kleen in atleast every-other tank. The truck has about 120k miles, with no other significant history. I did tinker with Biodiesel about 1 year ago, but only ran about 10 gallons thru the system. I replaced the water pump about 5k miles ago, but I can't see how that is related... I de-activated the Edge chip (put it on the stock setting) with no noticable difference. The engine never runs rough or poor, its just perfect, or "off" for 1/10 second shuddering stuff...

These same problems happened about 3 months ago, also on a road trip... but have since stopped... well, since yesterday...

Suggestions?
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2001 Ford Excursion Limited 4WD 7.3L PSD
Edge A2 Controller w/ Edge Juice Module
K&N Stage 2 Air Intake
Turbo-back Dynomax 4" Exhaust
Pioneer touchscreen DVD entertainment system w/ 3 LCD screens
2x 12" JBL Subwoofers w/ 1200w 8x-channel Pioneer Amplifier
5% Window Tint
Real HID headlights with 2003-style enclosures

 

Sounds like a cam sensor. The tach is usually the give away.
$15 at the following web site, and I hear they're pretty cheap at dealers now, too.
http://catalog.powerstrokeshop.com/p...99&catalogid=1