“After lunch, I restarted the
van and it began surging at idle, but differently than before.�  The WBX
will surge to 2200 - 2500 RPM, but after 1-2 seconds falls back to
idle.�  Rinse and repeat.”

        Just some food for thought on this >> Sometime in last couple of years I 

Manually caused this condition,, Can’t say absolutely but pretty darn sure I was

Slightly Opening Throttle while @ same time Having Idle Position Switch Stay in

Idle Position ~ This, of course, would suggest, that if IPS is out of adjustment it

can cause the symptom You describe ~

                                                        ORR ~ DeanB

> On 11 Aug , 2021, at 11:01 AM, Roy Nicholl <RNicholl@NBNET.NB.CA> wrote:
> 
> Tom,
> 
> That was my initial hope :-)� �  I unplugged; cleaned all contacts; put
> the meter on what I could.� �  This time it seems to be the internals of
> the ICU.
> 
> Tom Neal wrote on 2021.08.11 11:10:
>> A related thought which may not help the current thread:  When an idle gremlin appears, I unplug and plug back in the idle controller and/or swap it with my spare which seems to fix the gremlin.  Implication is a high resistance contact, the cause of about 80% of electrical problems.