84 vanagon, digifant, inline ABA Jetta motor....I've recently replaced the
fuel pump and filter and the sparkplugs.  Lubed the throttle linkage with
light spray lube.   All was normal "reading" with the spark plugs.  I
replaced the fuel pump after the old one failed (not so sure now) as I
recall a sustained downhill just prior to the pump failure...However, I put
on my spare and all was good, then replaced that with a new Bosch and still
all good.   The motor sounds perfect, has plenty of power, no smoking or
missing....smoooth running and sweet sounding, as always.  Same fuel
economy....
    But I was feeling an occasional hesitation after a sustained downhill
with no throttle, have been feeling that occasionally, but not serious,
till it stopped recently and I swapped the fuel pump on the road, then
replaced the spare.   I've put a few hundred miles on since that, with no
signs of what happened tonight, twice.

   Coastng downhill (about 6% grade) for perhaps a mile with no throttle at
all, then step back on the gas and nothing....No warning lights, normal
gauges temp and oil temp...just no motor...So I cycle the on off ignition
and get a few seconds of power than sputter and dies...still coasting
downhill...cycle again with the key and I get another burst of power, then
off...repeat, than it clears up and continues on, but I am careful to leave
some throttle on and no more weirdness...till I encounter another 3000"
descent...Same deal...coast for a mile or so without any gas on and when I
step back into it, nothing!   Another 4 or 5 off and on with the key and it
again clears up and runs normal.....No smoke or anything,
Feels sort of like the fuel is shut off,,,but only after I coast downhill
for a mile or two with the throttle shut....Uphill at 4000 or 5000 rpm and
full throttle, its smooth and happy....going through the mountains in all 5
gears like Dan Gurney, its sweet....if I keep a bit of throttle on going
downhill, it seems to behave, but let completely off and it sometimes just
quits, till I cycle the ignition and get it back (so far that works)
  Anybody have any ideas?   I am thinking throttle stop switch or maybe
fuel pump relay...or maybe ignition switch....Help?
   Don Hanson