This sounds a lot like a problem I had with my '84 although mine would
not only stumble while cruising but would also die at intersections or
while trying to cross them.  The problem also appeared right after a
head-gasket/fuel tank repair.  I assumed it was a dirty fuel filter
and took it back to the shop who replaced the filter but that didn't
solve the problem.  I read on the list to check both ground  straps,
one from the engine compartment wall to the cylinder head, and the
other under the car attached to the transmission.  The braided strap
attached to the cylinder head looked fine but when I tugged on it I
could feel it ripping.  I cleaned up the connection area and replaced
both straps with heavy duty ground cables from my FLAPS and haven't
had the problem again (1 yr).
-Chris

---John Thomas  wrote:
>
 > We will be driving along at maybe 55 or so and the engine will
hesitate
> (misfire) and then recover and be fine.  Usually it will then
reoccur at
> random intervals of anywhere from 1 to 5 minutes.  Usually if we stop,
> it will not do it again for awhile.
>
><snip>
>...
> Any ideas?
>
> John and Audrey
> Playmobile - 84 Westy
>

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