IF these symptoms arose AFTER the van got wet, AND go away AFTER running awhile, the O2 sensor is a suspect. Unplug the sensor wire, and try the same driving course, to try to duplicate the problem...

Brendan Slevin <brendan@BELLATAZZA.COM> wrote:  Well, Totoro has been running great since the rebuild but now (last three
days) has developed a hesitation. It drives fine in town but when I try to
get on it to get up to highway speed in 3rd or 4th it bogs way down and if I
don't lift seems as though it would die all they way. If I lift my foot and
slow a bit and down shift it seems fine again until the instant I try to
speed up again. Happening right around 4000 rpm on the tach. Plugged cat
maybe? I took some connections apart and cleaned them with elec. Cleaner in
a spray can. Even unplugged the ecu and plugged it back in. I did this all
this morning before starting the van. When I started it and warmed it up I
took it for a test drive. Was fine for about three miles and then started
it again. We've had a ton of snow and slush last week so I think something
got wet. Maybe the water causing the problem was frozen this morning (25
degrees F) and didn't cause a problem until thawing out. Also, am I
supposed to have and splash guards around the engine? Seems to be hole to
mount some on both side in the wheel wells.

Brendan
I have measured out my life with coffee spoons. -T.S. Eliot