oh wise brothers and sisters of the list..

Does anyone have any ideas as to what would
make my '82 Westfalia run on 2 cylinders (#1&2,
pulling the spark plug wire on #3 or 4 made no
difference in idle) when there's water on the
road (having rained, or crossing a low water
crossing)?  Sometimes it cuts out for just 10
seconds, sometimes for 5 minutes.  Last weekend
I crossed a low water crossing and it barely made
it out - I opened the engine hatch while it was
puttering on 2 and saw no water in the engine
compartment.  I'd rerouted the harness from the
brain to the injectors so that it wouldn't touch the
tin, but the tin was dry anyway.  Flooring the gas
pedal made no difference in idle, but holding it
between no throttle and floored would kill it.

Any ideas?

Thanks in advance!
Christopher Darilek
82 Westfalia
Austin, TX