When it's running OK take a spray bottle and mist the ignition wires,
distributor cap, and coil, etc. with water.  If you do this in the
dark, it will be easier to see any arcing that happens.  Might also
spray around the O2 sensor.
  Good luck,
Larry A.

On Sat, Jan 22, 2011 at 6:10 PM, Jeff Lincoln <magikvw@gmail.com> wrote:
> OK, I've been dealing with this for some time now. When it rains (snow
> doesn't seem to bother it) a medium to hard rain I can get about 15-20
> minutes down the road before rough running and eventually the engine just
> dies out.
>
> Cap, rotor, plug wires are all new. New Temp Sensor too (because previous
> diagnostics had proven it was a bit wonky).
>
> Everything in m's y gut tells me this is an electrical issue but I don't know
> for sure and even if I did I don't know where to start.
>
> When this happens if I let the bus sit for a day I can get it running again
> - but it takes a lot of messing with it - it will not idle at first, then it
> will run rough and stall - each attempt getting longer and longer until
> eventually I am able to keep it running and it recovers and runs fine. One
> other thing during the rough running period (when the problem starts and
> after it has sat and I am trying to get it going again) is that if I give it
> any gas at all it will stall immediately - eventually of course it is fine.
>
> I suspect by the way it acts after it has sat that it eventually gets better
> becuase whatever is wet is drying off more and more. Then again I don't
> really know anything.
>
> Any advice at all pointing me in ANY direction at this point is welcome.
>
> --
> Thanks,
>
> Jeff
> '85 GL (Gertie)
> '90 Carat (Grover - the noble parts donor)
> '86 (We call this one Scrap)
> '78 Bus (Melissa) Patty's Bus
>