My dad's Mercedes did the same thing. Ran great till it rained, then hesitated and stumbled for a few days. New wires and dizzy cap  fixed it nicely. 

Karl Wolz
Sent from my electronic umbilicus

On Jul 9, 2013, at 12:01 PM, Jeff Lincoln <magikvw@GMAIL.COM> wrote:

> That makes sense too John - but why would I only have problems when it's
> wet out? Dirty connection holding moisture?
> Thanks,
> 
> Jeff
> '85 GL (Gertie)
> '78 Bus (Melissa) Patty's Bus