Dick,  

Have you changed your fuel filter recently? Is it post pump? Any cavitation sounds or whining from the pump? Is the tank newer, free of crud?
When I have these issues I check for gunk slushing in the tank and creating an obstruction. These first happened to me a highway speeds. Much like you described. It was simpler as I have the square pre pump filter still. Every so often I have to blow bubbles into the tanks outlet hose to clear obstructions inside at the screen of the tank. 

Hth
Tony

> On Sep 11, 2014, at 12:53 AM, Dick Wong <sailingfc@DSLEXTREME.COM> wrote:
> 
> Well here goes.  Don't know if any of you have this engine configuration,
> but since it's a Vanagon, I'm asking here first.
> 
> Now that Blaze is back on the road, I get a miss/hiccup when moving with no
> load on the engine.  I've only noticed this in fourth gear and have not
> tried it in any other gear yet.
> 
> Typical situation: In fourth gear, level ground, steady speed.  While in
> this mode, the engine will suddenly lose power for several seconds, then
> recover.  It's not a sputter, it's a sudden loss. No dash lights illuminate,
> tach is steady, no CEL. All this happens in the 1800 to 2800 rpm range
> (approximately).  I've never experienced this before.  When accelerating or
> decelerating through this rpm range, it never happens, only when at a steady
> speed.  At freeway speeds, 3500 - 4500 rpm, I don't see this issue.
> 
> Digifant (023906023), 2.5L, 5 cylinder, new Bosch plug wires, new Bosch
> dist. cap, new Bosch rotor.
> 
> Since this is basically a Eurovan setup, that's my next stop.
> 
> Any ideas?
> 
> Thanks.
> 
> -Dick Wong-
> 78 Scirocco
> Original Owner
> 87 Vanagon Syncro 2.5 (Blaze)
> Third Owner
> 12 Golf TDI
> Original Co-Owner